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  • synonyms

ac

  1. Electricity. alternating current.
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Ac

Chemistry.
  1. acetate.
  2. acetyl.
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Ac

Symbol, Chemistry.
  1. actinium.
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AC

  1. Real Estate. air conditioning.
  2. Electricity. alternating current.
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ac-

  1. variant of ad- before c and qu: accede; acquire.
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-ac

  1. variant of -ic after Greek noun stems ending in i: cardiac; maniac.
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Origin of -ac

< Latin -acus < Greek -akos

a.c.1

  1. (in prescriptions) before meals.
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Origin of a.c.1

From the Latin word ante cibum

a.c.2

  1. Real Estate. air conditioning.
  2. Electricity. alternating current.
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A.C.1

  1. before Christ.
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Origin of A.C.1

From the Latin word ante Christum

A.C.2

  1. Real Estate. air conditioning.
  2. Electricity. alternating current.
  3. Army Corps.
  4. Athletic Club.
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A/C

or a/c

  1. Bookkeeping.
    1. account.
    2. account current.
  2. Real Estate. air conditioning.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

magneticelectricalheatservicerousingdynamictensestirringACDCvoltaictensionlightcurrentjuicesparkgalvanismutilitieselectronvoltage

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Historical Examples


British Dictionary definitions for ac

ac

the internet domain name for
  1. Ascension Island
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Ac

the chemical symbol for
  1. actinium
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AC

abbreviation for
  1. alternating currentCompare DC
  2. ante Christum
  3. Air Corps
  4. athletic club
  5. Companion of the Order of Australia
  6. appellation d'origine contrôlée: the highest French wine classification; indicates that the wine meets strict requirements concerning area of production, strength, etcSee VDQS, vin de pays, vin de table
  7. Aelodau'r Cynulliad: Member of the Assembly (that is, the National Assembly of Wales)
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Word Origin

(for sense 2) Latin: before Christ

a/c

abbreviation for
  1. account
  2. account current
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A/C

abbreviation for
  1. (in Canada) Air Commodore
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a.c.

abbreviation for
  1. (in prescriptions) ante cibum
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Word Origin

Latin: before meals
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ac

AC

abbreviation of air conditioning, by 1966.

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Online Etymology Dictionary, © 2010 Douglas Harper

ac in Medicine

ac

abbr.
  1. ante cibum (before a meal)
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Ac

  1. The symbol for the elementactinium

ac-


ac in Science

Ac

AC

actinium

[ăk-tĭnē-əm]
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.