CA

n. silvery metallic element present in the earth as well as in most animals and plants

n. around, approximately (used especially with dates)

state on the western coast of the United States

company authorized to issue digital certificates which are used to authenticate a user or organization's identity during secure Internet transactions (Computers)

CA may stand for:Circa (ca.).Class A.People and organizationsAir China, IATA airline designator (CA).Bureau of Consular Affairs, a division of the US Department of State.CA, Inc. (formerly known as Computer Associates).Canadian Alliance, a former Canadian political party.Cannabis Assembly, a UK organisation promoting the religious use of Cannabis.C&A stores.Carmelo Anthony, an NBA player.Cary Academy, a North Carolina school.Catamarca, a province in Argentina.Cayman Airways, airline.Central AdministrationChannel America, a defunct US television network.Chartered accountant (CA).Chief of Army (Australia)Christian anarchist, an adherent of Christian anarchism. Christina Aguilera, singer and songwriter.Citizens' Alliance, a political party in Trinidad and Tobago.Civil Affairs, the official name for military units that conduct civil-military operations.Classic Army, an Hong Kong based manufacturer of airsoft replicas.Cocaine Anonymous.Conscientious Arsonists, Greek terrorist organizationCountryside Alliance, UK.Creative Assembly, PC Game DeveloperCrédit Agricole.Cycling AustraliaConfidential Agreement Regional
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.ca is the Internet country code top-level domain (ccTLD) for Canada. Registrants of .ca domains must meet Canadian Presence Requirements as defined by the registry. Examples of valid entities include:a Canadian citizen of the age of majority, a permanent resident of Canada, a legally recognized Canadian organization, an Inuit, First Nation, Métis or other people indigenous to Canada, an Indian Band as defined in the Indian Act of Canada,a foreign resident of Canada that holds a registered Canadian trademark, An executor, administrator or other legal representative of a person or organization that meets the requirements,a division of the government,Her Majesty Queen Elizabeth II.
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Calcium (IPA: ) is the chemical element in the periodic table that has the symbol Ca and atomic number 20. It has an atomic mass of 40.078. Calcium is a soft grey alkaline earth metal, and is the fifth most abundant element in the Earth's crust. It is essential for living organisms, particularly in cell physiology, and is the most common metal in many animals.
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Circa (often abbreviated c., ca., ca or cca. and sometimes italicized to show it is Latin) literally means "about" or "around". It is widely used in genealogy and historical writing, when the dates of events are approximately known.For example, an encyclopedia entry for Genghis Khan may begin with "Genghis Khan (circa 1162–August 18, 1227)".When used in date ranges, a circa is applied before each approximate date, while dates without a circa immediately preceding them are generally assumed to be known with certainty. For instance, the 1162 in the above example is approximate, but the August 18, 1227 is known.
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The Clandestine Insurgent Rebel Clown Army (or CIRCA or Smile LiberAtion Front) is a United Kingdom-based anti-authoritarian left-wing activist group that uses clowning and other non-violent actions to challenge corporate globalisation, war and similar actions that the group opposes.CIRCA emerged out of the direct action movement and has participated in protests against George W Bush's visit to the UK in 2003 and demonstrations against the 2003 invasion of Iraq. The group was particularly prominent in many of the actions organised around the 31st G8 summit held in Gleneagles during July 2005.
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CA cardiac arrest ; coronary artery. Ca calcium. Ca The symbol for the element calcium. CA abbr. 1. cancer 2. carcinoma 3. chronologic age 4. [more]CA - Community and Resources

Noun
1. a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes
(synonym) California, Golden State, Calif.
(hypernym) American state
(hyponym) Colorado Desert
(part-holonym) United States, United States of America, America, US, U.S., USA, U.S.A.
(part-meronym) Channel Islands National Park

Noun
1. a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
(synonym) calcium, atomic number 20
(hypernym) metallic element, metal
(hyponym) calcium ion, factor IV
(substance-holonym) calcium oxide, quicklime, lime, calx, calcined lime, fluxing lime, unslaked lime, burnt lime

ca, approx; circa, approximately, around, nearly, closely, about