a/cabbr. account currentAmerican Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.a/c abbreviation for 1. (Accounting & Book-keeping) account 2. (Accounting & Book-keeping) account current A/C abbreviation for (Military) (in Canada)Air Commodore Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014AC or A.C. 1. air conditioning. 2. Also, ac, a.c., alternating current. 3. before Christ. [