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, a U.S. software company * Cayman Airways, a Cayman Islands airline * Channel America, 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, 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, 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 * 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 Acade ...

, 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, 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 Club Africain ( ar, النادي الإفريقي) is a Tunisian football club based in Tunis that competes in the Tunisian Championship. It fields several sports teams, including football, handball, basketball, swimming and volleyball. The foot ...

, 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 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 French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with France ...

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

Carbonic anhydrase The carbonic anhydrases (or carbonate dehydratases) () form a family of enzymes that catalyze the interconversion between carbon dioxide and water and the dissociated ions of carbonic acid (i.e. bicarbonate and hydrogen ions). The active site ...

, 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

Chemistry

* Calcium, symbol Ca, a chemical element * Catecholamine, an organic compound * Cellulose acetate, a type of plastic * ''Chemical Abstracts'', a publication of Chemical Abstracts Service *

Cyanoacrylate Cyanoacrylates are a family of strong fast-acting adhesives with industrial, medical, and household uses. They are derived from ethyl cyanoacrylate and related esters. The cyanoacrylate group in the monomer rapidly polymerizes in the presence ...

, a chemical compound

Mathematics and computing

* Cellular automaton, a discrete mathematical model * Certificate authority, an entity issuing digital certificates for secure communications *

Correspondence analysis Correspondence analysis (CA) is a multivariate statistical technique proposed by Herman Otto Hartley (Hirschfeld) and later developed by Jean-Paul Benzécri. It is conceptually similar to principal component analysis, but applies to categorical rat ...

, 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 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 (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, 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 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, US state by postal abbreviation * Canada, 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 * 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 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's US Navy hull classification