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Variant of ad-..
American 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.
AC or A.C.
1. air conditioning.
2. Also, ac, a.c., alternating current.
3. before Christ.
[< Latin ante Christum]
var. of ad- before c and qu: accede; acquire.
var. of -ic after Greek noun stems ending in i: cardiac; maniac.
[< Latin -acus < Greek -akos]
2. account current.
3. air conditioning.
(in prescriptions) before meals.
[< Latin ante cibum]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.