ca

1. alternativeAlternative spelling of ca., circa.

1. abbreviationAbbreviation of California: a state of the United States.
2. abbreviationAbbreviation of Canada: a country in North America.
3. CanadianabbreviationinitialismgovernmentInitialism of Canadian Alliance, Conservative-Reform Alliance Party, Reform-Conservative Alliance Party.
4. abbreviationinitialismcomputingInitialism of Computer Associates, an American software company.
5. abbreviationball gamesAbbreviation of Cricket Australia, the governing body of cricket in Australia.
6. PhilippinesabbreviationAbbreviation of Clark Airbase.
7. PhilippinesabbreviationAbbreviation of Commission on Appointments.
8. abbreviationhuman sciencesAbbreviation of Classical Arabic

plural CAs

1. abbreviationcountableinitialismuncountablecellular automataInitialism of cellular automaton.

   I assume we are speaking of a single rule CA (one rule for every cell).

   2013 October 31, Shawn LeGrand, “Question about one-dimensional cellular automaton with a finite number of cells”, in comp.theory.cell-automata (Usenet)

   2 more examples

   BTW: Of course the rules were parametrised, so any totalistic 2-dimensional 9-neighbourhood CA could be run.

   1989 March 21, Mark Kramer, “Fast LIFE (was: Re: summing 9-cell neighborhoods)”, in comp.theory.cell-automata (Usenet)

   The new CA is a modification of Fredkin's earlier SALT architecture in which every cell is identified as either even or odd - as in sodium and chlorine in a salt crystal hence the name. The state of each cell is either up or down and the development rule simple takes account of states of odd and even neighbours. The up-date at each time step simply takes the form of a swap of the states of diagonally related cells. SALT CAs are reversible and capable of universal computation and are conjectured to be capable of universal construction in the sense of Von Neumann.

   2012 July 3, Mike James, “A New Computational Universe - Fredkin's SALT CA”, in www.i-programmer.info, retrieved 25 Oct 2012

2. abbreviationcountableinitialismuncountablecomputingInitialism of certificate authority.

   Well-designed CAs will create a trust hierarchy, which consists of a root with a number of subroots, to further enhance protection of the private key.

   2003, Kapil Raina, PKI Security Solutions for the Enterprise, page 30

3. USabbreviationcountableinitialismuncountablenauticalInitialism of armored cruiser, a type of warship.
4. USabbreviationcountableinitialismuncountablenauticalInitialism of heavy cruiser, a variant of the cruiser type of warship.
5. USabbreviationcountableinitialismuncountablegovernmentInitialism of civil affairs, a military occupational specialty or branch.
6. abbreviationcountableuncountablechemistryAbbreviation of cyanoacrylate.
7. AustraliaCanadaNew ZealandScotlandSouth AfricaabbreviationcountableinitialismuncountableaccountingInitialism of chartered accountant.
8. JapanabbreviationcountableinitialismuncountableInitialism of cabin attendant.
9. abbreviationcountableinitialismuncountableInitialism of central authority.
10. UKabbreviationcountableinitialismuncountablegovernmentInitialism of combined authority.
11. UKabbreviationcountableinitialismuncountablelawInitialism of Companies Act.
12. abbreviationcountableinitialismuncountableInitialism of communications assistant.
13. abbreviationcountableinitialismuncountableInitialism of closed access, as opposed to open access.
14. abbreviationinitialismuncountablehuman sciencesInitialism of conversation analysis.
15. abbreviationcountableinitialismuncountableInitialism of civic amenity.