CA or ca may refer to:

Businesses and organizations

Companies

Air China Air China Limited () is the flag carrier of the People's Republic of China and one of the "Big Three" mainland Chinese airlines (alongside China Southern Airlines and China Eastern Airlines). Air China's headquarters are in Shunyi District, ...

(IATA airline code CA) *

CA Technologies CA Technologies, formerly known as CA, Inc. and Computer Associates International, Inc., is an American multinational corporation headquartered in New York City. It is primarily known for its business-to-business (B2B) software with a product po ...

, a U.S. software company *

Cayman Airways Cayman Airways is the flag carrier airline of the British Overseas Territory of the Cayman Islands. With its head office in Grand Cayman, it operates mainly as an international and domestic scheduled passenger carrier, with cargo services avai ...

, a Cayman Islands airline *

Channel America Channel America (CA), officially Channel America Network, Inc., was the first United States terrestrial broadcast television network to be intentionally assembled out of LPTV, or low-power television licensees. The network was founded by David Po ...

, a defunct U.S. television network *

Classic Army Classic Army (Yick Fung International) is a manufacturer of airsoft replicas based in Hong Kong. It produces automatic electric guns or AEGs, and a small number of GBB (Gas Blowback) pistols. Designed to resemble real firearms, these replicas fire ...

, a Hong Kong-based manufacturer of airsoft replicas *

Coal & Allied Coal & Allied is an Australia coal mining company. Operating mines in the Hunter Region, it is a subsidiary of Yancoal. History Coal & Allied was formed in 1960 when Caledonian Collieries and J & A Brown & Abermain-Seaham Collieries merged. H ...

, Australian mining company *

Continental Airlines Continental Airlines, simply known as Continental, was a major United States airline founded in 1934 and eventually headquartered in Houston, Texas. It had ownership interests and brand partnerships with several carriers. Continental started o ...

, a U.S. airline *

Creative Assembly The Creative Assembly Limited (trade name: Creative Assembly) is a British video game developer based in Horsham, founded in 1987 by Tim Ansell. In its early years, the company worked on porting games to MS-DOS from Amiga and ZX Spectrum platfor ...

, a PC game developer * Crédit Agricole, a major French bank

Government and political

Bureau of Consular Affairs The Bureau of Consular Affairs (CA) is a bureau of the United States Department of State reporting to the under secretary of state for management. The mission of the Bureau is to administer laws, formulate regulations and implement policies re ...

, a division of the U.S. Department of State *

Canadian Alliance The Canadian Alliance (french: Alliance canadienne), formally the Canadian Reform Conservative Alliance (french: Alliance réformiste-conservatrice canadienne), was a centre-right to right-wing federal political party in Canada that existed u ...

, a former Canadian political party *

Centre Alliance Centre Alliance, formerly known as the Nick Xenophon Team (NXT), is a centrist political party in Australia based in the state of South Australia. It currently has one representative in the Parliament, Rebekha Sharkie in the Australian House o ...

, Australian political party formerly known as Nick Xenophon Team * Citizens' Alliance, a political party in Trinidad and Tobago *

Combined authority A combined authority is a type of local government institution introduced in England outside Greater London by the Local Democracy, Economic Development and Construction Act 2009. Combined authorities are created voluntarily and allow a grou ...

, a local government entity in the United Kingdom *

Commission on Appointments The Commission on Appointments ( fil, Komisyon sa Paghirang, abbreviated as CA) is a constitutional body which confirms or rejects certain political appointments made by the President of the Philippines. The current commission was created by th ...

, a body of the Congress of the Philippines * Conservatives Abroad, overseas wing of the British Conservative Party *

Countryside Alliance The Countryside Alliance (CA) is a British organisation promoting issues relating to the countryside such as farming, rural services, small businesses and field sports, aiming to "Give Rural Britain a voice". History The Countryside Alliance ...

, a British political organization *

Court of Appeals A court of appeals, also called a court of appeal, appellate court, appeal court, court of second instance or second instance court, is any court of law that is empowered to hear an appeal of a trial court or other lower tribunal. In much of ...

Customs Administration The Customs Administration, Ministry of Finance (CA; ) is the agency of the Ministry of Finance of Taiwan (ROC) dealing with customs policies and regulations in Taiwan. Republic of China is not a Member of World Customs Organization but ROC h ...

, an agency of Taiwan

Schools

Canadian Academy Canadian Academy (CA; カナディアン・アカデミー ''Kanadian Akademii''), founded in 1913, is an independent pre-K – grade 12 international school in Kobe, Japan. The day and boarding school consists of an elementary school, middle schoo ...

, an international school in Kobe, Japan * Cary Academy, a private college-preparatory school in Cary, North Carolina, United States *

Claiborne Academy Claiborne Academy is a private school, private, non-profit, pre-kindergarten through 12th grade school located in unincorporated area, unincorporated Claiborne Parish, Louisiana, Claiborne Parish, Louisiana, near Haynesville, Louisiana, Haynesvill ...

, a private school in Claiborne Parish, Louisiana, United States *

Clarksville Academy Clarksville Academy is a private college-preparatory school in Clarksville, Tennessee, offering pre-kindergarten through grade 12. The school has several sports teams with a cougar as their mascot and school colors being royal blue and yellow gold ...

, a private college-preparatory school in Clarksville, Tennessee, United States *

Colorado Academy Colorado Academy is an independent nonsectarian, co-educational, college preparatory day school for students from Pre-Kindergarten through Twelfth Grade. The school's campus is located in Lakewood, Colorado, and serves approximately 1000 studen ...

, a private college-preparatory school in Lakewood, Colorado, United States *

Concord Academy Concord Academy (also known as CA), established in 1922, is a coeducational, independent college preparatory school for boarding and day students in grades 9-12. The school is situated in Concord, Massachusetts. In 1971, Concord Academy became t ...

, a private college-preparatory school in Concord, Massachusetts, United States *

Connections Academy Connections Academy, a for-profit corporate provider of online school products and services to virtual schools for grades K-12, including full-time online schools with the name Connections Academy, in the United States and International Connectio ...

, an online school based in Baltimore, Maryland, United States *

Culver Academies Culver Academies is a college preparatory boarding school located in Culver, Indiana, which is composed of three entities: Culver Military Academy (CMA) for boys, Culver Girls Academy (CGA), and the Culver Summer Schools and Camps (CSSC). Culve ...

, a boarding school and summer camp program in Culver, Indiana, United States

In sport

California Angels The Los Angeles Angels are an American professional baseball team based in the Los Angeles metropolitan area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) West division. Since 1966, the team ha ...

, former name of a professional baseball team currently known as Los Angeles Angels * Club Africain, a multi-sport club from Tunis, Tunisia *

Cricket Australia Cricket Australia (CA), formerly known as the Australian Cricket Board (ACB), is the governing body for professional and amateur cricket in Australia. It was originally formed in 1905 as the 'Australian Board of Control for International Crick ...

, the governing body for professional and amateur cricket in Australia *

Cruising Association The Cruising Association (CA) which was founded in 1908 is the largest British-based organisation which caters exclusively for cruising sailors. Membership is composed of sailors based in the UK and around the world who cruise inland, inshore and ...

, a UK membership organization for sailors *

Cycling Australia Cycling Australia (CA), the trading name of the Australian Cycling Federation Inc, was the national governing body for bicycle racing in Australia, and represented the interests of affiliated cycling clubs and State federations. It covered the d ...

, the national governing body for bicycle racing in Australia

Other organizations

* Caterers' Association, former UK trade association *

Cocaine Anonymous Cocaine Anonymous (C.A.) is a twelve-step program formed in 1982 for people who seek recovery from drug addiction. It is patterned very closely after Alcoholics Anonymous, although the two groups are unaffiliated. While many C.A. members have been ...

, a twelve-step program * Creativity Alliance, an arm of

Creativity (religion) Creativity, historically known as The (World) Church of the Creator, is an atheistic ( "nontheistic") white supremacist religious movement which espouses white separatism, antitheism, antisemitism, scientific racism, homophobia, and religious ...

, a white supremacist organization

In linguistics

* ''ca.'', abbreviation for ''

circa Circa is a word of Latin origin meaning 'approximately'. Circa or CIRCA may also refer to: * CIRCA (art platform), art platform based in London * Circa (band), a progressive rock supergroup * Circa (company), an American skateboard footwear com ...

'' (''latin''), meaning approximately * ''Ça'', French demonstrative pronoun * Ca (Indic), a glyph in the Brahmic family of scripts * Ca (Javanese), a letter in the Javanese script *

Catalan language Catalan (; autonym: , ), known in the Valencian Community and Carche as ''Valencian'' (autonym: ), is a Western Romance language. It is the official language of Andorra, and an official language of three autonomous communities in eastern Spa ...

(ISO 639 alpha-2 language code) * ca, the subdomain for

Catalan Wikipedia The Catalan Wikipedia ( ca, Viquipèdia en català) is the Catalan language, Catalan-language edition of the Wikipedia Free content, free online encyclopedia. It was created on March 16, 2001, just a few minutes after the first non-English Wikip ...

Contrastive analysis Contrastive analysis is the systematic study of a pair of languages with a view to identifying their structural differences and similarities. Historically it has been used to establish language genealogies. Second language acquisition Contrasti ...

, the systematic study of a pair of languages

Mathematics, science, and technology

Biology and medicine

* ''CA'' (journal), a medical journal * ''Ca'' (moth), a moth genus * ''Ca.'', abbreviation for ''

Candidatus In prokaryote nomenclature, ''Candidatus'' (Latin for candidate of Roman office) is used to name prokaryotic phyla that are well characterized but yet-uncultured. Contemporary sequencing approaches, such as 16S sequencing or metagenomics, provide m ...

'', for taxonomical names that have not been completely described *

Cancer Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread. Possible signs and symptoms include a lump, abnormal b ...

* Carbonic anhydrase, a family of enzymes *

Carcinoma Carcinoma is a malignancy that develops from epithelial cells. Specifically, a carcinoma is a cancer that begins in a tissue that lines the inner or outer surfaces of the body, and that arises from cells originating in the endodermal, mesodermal ...

, a type of cancer *

Cardiac arrest Cardiac arrest is when the heart suddenly and unexpectedly stops beating. It is a medical emergency that, without immediate medical intervention, will result in sudden cardiac death within minutes. Cardiopulmonary resuscitation (CPR) and possib ...

Chemistry

Calcium Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to ...

, symbol Ca, a chemical element *

Catecholamine A catecholamine (; abbreviated CA) is a monoamine neurotransmitter, an organic compound that has a catechol (benzene with two hydroxyl side groups next to each other) and a side-chain amine. Catechol can be either a free molecule or a subst ...

, an organic compound *

Cellulose acetate In biochemistry, cellulose acetate refers to any acetate ester of cellulose, usually cellulose diacetate. It was first prepared in 1865. A bioplastic, cellulose acetate is used as a film base in photography, as a component in some coatings, and ...

, a type of plastic * ''Chemical Abstracts'', a publication of

Chemical Abstracts Service CAS (formerly Chemical Abstracts Service) is a division of the American Chemical Society. It is a source of chemical information. CAS is located in Columbus, Ohio, United States. Print periodicals ''Chemical Abstracts'' is a periodical index tha ...

* Cyanoacrylate, a chemical compound

Mathematics and computing

Cellular automaton A cellular automaton (pl. cellular automata, abbrev. CA) is a discrete model of computation studied in automata theory. Cellular automata are also called cellular spaces, tessellation automata, homogeneous structures, cellular structures, tessel ...

, a discrete mathematical model *

Certificate authority In cryptography, a certificate authority or certification authority (CA) is an entity that stores, signs, and issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate. This ...

, an entity issuing digital certificates for secure communications * Correspondence analysis, a multivariate statistical technique *

Cultural algorithm Cultural algorithms (CA) are a branch of evolutionary computation where there is a knowledge component that is called the belief space in addition to the population component. In this sense, cultural algorithms can be seen as an extension to a co ...

, a type of evolutionary computation in computer science

Other uses in science and technology

* Centiampere (cA), an SI unit of electric current *

Certificate Authority In cryptography, a certificate authority or certification authority (CA) is an entity that stores, signs, and issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate. This ...

(CA), an entity that issues digital certificates * ''CA''-class submarine, a World War II Italian midget submarine *

Nissan CA engine The CA engine is a series of Inline-4 piston engines from Nissan. It is designed for a wide variety of smaller Nissan vehicles to replace the Z engine and some smaller, four-cylinder L series engines. The "CA" stands for Clean Air, due to the ...

, used in smaller Nissan vehicles *

Chromatic aberration In optics, chromatic aberration (CA), also called chromatic distortion and spherochromatism, is a failure of a lens to focus all colors to the same point. It is caused by dispersion: the refractive index of the lens elements varies with the wave ...

, a distortion in optical lenses *

Conditional access Conditional access (CA) is a term commonly used in relation to software and to digital television systems. Conditional access is that ‘just-in-time’ evaluation to ensure the person who is seeking access to content is authorized to access the c ...

, in broadcast engineering *

Conservation agriculture Conservation agriculture (CA) can be defined by a statement given by the Food and Agriculture Organization of the United Nations as "Conservation Agriculture (CA) is a farming system that can prevent losses of arable land while regenerating degrad ...

, a food system *

Conversation Analysis Conversation analysis (CA) is an approach to the study of social interaction, embracing both verbal and non-verbal conduct, in situations of everyday life. CA originated as a sociological method, but has since spread to other fields. CA began with ...

, the study of talk in interaction

Places

Cả River The Cả River ( Laotian: Nam Khan, Vietnamese: Sông Cả or better known as sông Lam or Lam River wikt:藍) is a river in mainland Southeast Asia. Etymology The name ''Cả'' means "first" in Vietnamese language, possibly alluding to the rive ...

, in Laos and Vietnam *

Province of Cádiz Cádiz is a Provinces of Spain, province of southern Spain, in the southwestern part of the Autonomous communities of Spain, autonomous community of Andalusia. It is the southernmost part of mainland Spain, as well as the southernmost part of conti ...

, Spain *

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

, US state by postal abbreviation *

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

, by ISO 3166-1 alpha-2 code **

.ca .ca is the Internet country code top-level domain (ccTLD) for Canada. The domain name registry that operates it is the Canadian Internet Registration Authority (CIRA). Registrants can register domains at the second level (e.g., ''example.ca'') ...

, Internet country code for Canada *

City of Carlisle The City of Carlisle ( , ) is a local government district of Cumbria, England, with the status of a city and non-metropolitan district. It is named after its largest settlement, Carlisle, but covers a far larger area which includes the towns ...

, United Kingdom, by postcode *

Catamarca Province Catamarca () is a province of Argentina, located in the northwest of the country. The province had a population of 334,568 as per the , and covers an area of 102,602 km2. Its literacy rate is 95.5%. Neighbouring provinces are (clockwise, fr ...

, Argentina *

Central America Central America ( es, América Central or ) is a subregion of the Americas. Its boundaries are defined as bordering the United States to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. ...

Tokyo Bay Aqua-Line The , also known as the Trans-Tokyo Bay Expressway, is an expressway that is mainly made up of a bridge–tunnel combination across Tokyo Bay in Japan. It connects the city of Kawasaki in Kanagawa Prefecture with the city of Kisarazu in Chiba ...

, a bridge-tunnel across Tokyo Bay area in Japan, numbered as CA

Other uses

* CA-, a

road designation A route (or road) number, designation or abbreviation is an identifying numeric (or alphanumeric) designation assigned by a highway authority to a particular stretch of roadway to distinguish it from other routes and, in many cases, also to indica ...

for highways part of the Central American highway network * CA, the official designation for

heavy cruiser The heavy cruiser was a type of cruiser, a naval warship designed for long range and high speed, armed generally with naval guns of roughly 203 mm (8 inches) in caliber, whose design parameters were dictated by the Washington Naval Tr ...

in the U.S. Navy from 1920–1945 * 'CA': Tactical Naval Warfare in the Pacific 1941-43, a 1973 board wargame that simulates World War II naval combat * Ca Mè Mallorquí, a dog breed native to Spain *

centiare The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), or 10,000 m2, and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is a ...

= 1 square metre * Chartered Accountant * Civil affairs, a term used by both the United Nations and by military institutions *

Communication arts (disambiguation) Communication (from la, communicare, meaning "to share" or "to be in relation with") is usually defined as the transmission of information. The term may also refer to the message communicated through such transmissions or the field of inquir ...

Confidentiality agreement A non-disclosure agreement (NDA) is a legal contract or part of a contract between at least two parties that outlines confidential material, knowledge, or information that the parties wish to share with one another for certain purposes, but wish ...

* Current account (disambiguation), in economics *

Heavy Cruiser The heavy cruiser was a type of cruiser, a naval warship designed for long range and high speed, armed generally with naval guns of roughly 203 mm (8 inches) in caliber, whose design parameters were dictated by the Washington Naval Tr ...

's US Navy hull classification