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 p ...

, a U.S. software company * Cayman Airways, a Cayman Islands airline * Channel America, a defunct U.S. television network * Classic Army, a Hong Kong-based manufacturer of airsoft replicas * Coal & Allied, 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 ...

, a U.S. airline * Creative Assembly, a PC game developer *

Crédit Agricole Crédit Agricole Group (), sometimes called La banque verte ( en, The green bank) due to its historical ties to farming, is a French international banking group and the world's largest cooperative financial institution. It is France's second lar ...

, a major French bank

Government and political

* Bureau of Consular Affairs, a division of the U.S. Department of State * Canadian Alliance, a former Canadian political party * Centre Alliance, Australian political party formerly known as Nick Xenophon Team *

Citizens' Alliance Citizens' Alliances were state and local anti-trade union organizations prominent in the United States of America during the first decade of the 20th century. The Citizen's Alliances were closely related to employers' associations but allowed par ...

, a political party in Trinidad and Tobago * Combined authority, a local government entity in the United Kingdom * Commission on Appointments, a body of the Congress of the Philippines *

Conservatives Abroad Conservatives Abroad is the British Conservative Party's global network of members & supporters living overseas. Conservatives Abroad has members and groups around the world, including Europe, Asia, Africa, the Americas, and Oceania Oceani ...

, overseas wing of the British Conservative Party * 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 ...

* Customs Administration, an agency of Taiwan

Schools

* Canadian Academy, an international school in Kobe, Japan *

Cary Academy Cary Academy is an independent, coeducational, nonsectarian, college-preparatory secondary school located in Cary, North Carolina. The school emphasizes the use of technology in the classroom, the arts, and foreign exchange. History Cary A ...

, a private college-preparatory school in Cary, North Carolina, United States * Claiborne Academy, a private school in Claiborne Parish, Louisiana, United States * Clarksville Academy, a private college-preparatory school in Clarksville, Tennessee, United States * Colorado Academy, a private college-preparatory school in Lakewood, Colorado, United States * Concord Academy, 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, 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, the governing body for professional and amateur cricket in Australia * Cruising Association, a UK membership organization for sailors * Cycling Australia, the national governing body for bicycle racing in Australia

Other organizations

Caterers' Association The British Hospitality Association (BHA), incorporating The Restaurant Association (RA), was a non-government representative body for hotels, clubs, restaurants, leisure outlets and other hospitality-related organisations nationwide headquartere ...

, former UK trade association * Cocaine Anonymous, a twelve-step program * Creativity Alliance, an arm of Creativity (religion), a white supremacist organization

In linguistics

* ''ca.'', abbreviation for '' circa'' (''latin''), meaning approximately * ''Ça'', French demonstrative pronoun *

Ca (Indic) Ca is the sixth consonant of Indic abugidas. In modern Indic scripts, ca is derived from the early "Ashoka" Brahmi letter , which is probably derived from the North Semitic letter tsade (reflected in the Aramaic , "ts"), with an inversion seen i ...

, a glyph in the Brahmic family of scripts *

Ca (Javanese) is one of syllable in Javanese script that represent the sound /tʃɔ/, /tʃa/. It is transliterated to Latin as "ca", and sometimes in Indonesian orthography as "co". It has another form (''pasangan''), which is , but represented by a single Un ...

, 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 eas ...

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

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, provid ...

'', 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 bl ...

* 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, mesoderma ...

, 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 t ...

, 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 ...

, 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, ...

, 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 th ...

* 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, tess ...

, 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. Th ...

, an entity issuing digital certificates for secure communications * Correspondence analysis, a multivariate statistical technique * Cultural algorithm, a type of evolutionary computation in computer science

Other uses in science and technology

Centiampere The ampere (, ; symbol: A), often shortened to amp,SI supports only the use of symbols and deprecates the use of abbreviations for units. is the unit of electric current in the International System of Units (SI). One ampere is equal to elect ...

(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. Th ...

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

, 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, a food system * Conversation Analysis, the study of talk in interaction

Places

* Cả River, in Laos and Vietnam *

Province of Cádiz Cádiz is a province of southern Spain, in the southwestern part of the autonomous community of Andalusia. It is the southernmost part of mainland Spain, as well as the southernmost part of continental Europe. It is bordered by the Spanish provinc ...

, Spain *

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the ...

, 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 tota ...

, 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, 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, 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 ...

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 The Ca Mè Mallorquí is a Spanish breed of pointing dog originating in the Mediterranean island of Mallorca, in the Balearic Islands. It was traditionally used as a pointing dog in hunting. It was officially recognised by the national government ...

, a dog breed native to Spain * centiare = 1 square metre * Chartered Accountant * Civil affairs, a term used by both the United Nations and by military institutions * Communication arts (disambiguation) * Confidentiality agreement *

Current account (disambiguation) Current account or Current Account may refer to: * Current account (balance of payments), a country's balance of trade, net of factor income and cash transfers * Current account (banking), a checking account, held at a bank or other financial insti ...

, 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 ...

's US Navy hull classification