ACA

acronym: Advanced Computer Applications (project)
Found on http://cdiac.ornl.gov/pns/acronyms.html#A

ACA

Type: Abbreviation Definitions: 1. Abbreviation for accommodative convergence:accommodation ratio.
Found on http://www.medilexicon.com/medicaldictionary.php?t=356

ACA

Airspace Coordination Area: A three-dimensional box in the sky defined by grid and/or land references and an altitude block (AGL). The intent of an ACA is to allow simultaneous attack of targets near each other by multiple fire support means, one of which is air. (See Army Field Manual 6-20).
Found on http://www.f-16.net/glossary-A.html
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