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• ac
  ac

  abbreviation

  acre; acres.
• Ac
  Ac

  abbreviation

  acetate.
• AC
  AC

  abbreviation

  alternating current.
• A/C
  A/C

  abbreviation

  air conditioning.
• ac-
  ac-

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

  variant of -ic after Greek noun stems ending in i: cardiac; maniac.
• a.c.
  a.c.

  abbreviation

  (in prescriptions) before meals.
• A.C.
  A.C.

  abbreviation

  before Christ.
• a/c
  a/c

  abbreviation

  account

ac

¹ American  

abbreviation

1. acre; acres.

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Ac ² American  

abbreviation

Chemistry.

1. acetate.

2. acetyl.

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Ac ³ American  

Symbol, Chemistry.

1. actinium.

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AC ⁴ American  

abbreviation

Electricity.

1. alternating current.

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A/C ⁵ American  

[ey-see] / ˈeɪˈsi /

Also AC, or a/c

abbreviation

1. air conditioning.

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A/C ⁶ American  

Or a/c

abbreviation

Bookkeeping.

1. account.

2. account current.

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ac- ⁷ American  

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

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-ac ⁸ American  

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

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a.c. ⁹ American  

abbreviation

1. (in prescriptions) before meals.

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A.C. ¹⁰ American  

abbreviation

1. before Christ.

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A.C. ¹¹ American  

abbreviation

1. Army Corps.

2. Athletic Club.

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a.c. ¹ British  

abbreviation

1. (in prescriptions) ante cibum

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AC ² British  

abbreviation

1. alternating current Compare 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, etc See 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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ac ³ British  

abbreviation

1. Ascension Island

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A/C ⁴ British  

abbreviation

1. Air Commodore

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a/c ⁵ British  

abbreviation

1. account

2. account current

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Ac ⁶ British  

symbol

1. actinium

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AC Scientific  

1. Abbreviation of alternating current

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Etymology

Origin of -ac⁸

From Latin -acus, from Greek -akos

Origin of a.c.⁹

From Latin ante cibum

Origin of A.C.¹⁰

From Latin ante Christum

Example Sentences

While power grids run on AC, most modern electronics convert it to DC internally.

From The Wall Street Journal • Apr. 24, 2026

The neutron scattering and AC magnetic susceptibility work at Rice was supported by the U.S.

From Science Daily • Apr. 22, 2026

Modine provides everything data centers need to cool chips: rear-door heat exchangers, AC units, chillers, and coolant distribution units.

From Barron's • Apr. 16, 2026

He hasn’t scored for the U.S. since November 2024 and hasn’t scored for his club team, AC Milan, this year.

From Los Angeles Times • Apr. 7, 2026

Before I started writing, I went to the thermostat and blasted the AC to sixty-five degrees.

From "The Epic Fail of Arturo Zamora" by Pablo Cartaya

Related Words

• magnetic