ac

abbreviation

acre; acres.

Other definitions for Ac (2 of 11)

Ac¹

abbreviationChemistry.

acetate.
acetyl.

Other definitions for Ac (3 of 11)

Ac²

Symbol, Chemistry.

actinium.

Other definitions for AC (4 of 11)

abbreviationElectricity.

alternating current.

Other definitions for ac- (5 of 11)

ac-

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

Other definitions for -ac (6 of 11)

-ac

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

Origin of -ac

⁶

From Latin -acus, from Greek -akos

Other definitions for a.c. (7 of 11)

a.c.

abbreviation

(in prescriptions) before meals.

Origin of a.c.

⁷

From Latin ante cibum

Other definitions for A/C (8 of 11)

A/C¹

or a/c

[ ey-see ]

abbreviation, noun

air conditioning.

Also AC, A.C., a.c.

Other definitions for A/C (9 of 11)

A/C²

abbreviationBookkeeping.

Other definitions for A.C. (10 of 11)

A.C.¹

abbreviation

before Christ.

Origin of A.C.

¹⁰

From Latin ante Christum

Other definitions for A.C. (11 of 11)

A.C.²

abbreviation

Army Corps.
Athletic Club.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use ac in a sentence

It's a sweltering hot day in London today, a real British heat wave with no a/c, and the Jubilee enthusiasm is papable.
London Heating Up | Tom Sykes | May 29, 2012 | THE DAILY BEAST
A place to curse Osama and the decade he made, and a place to transfer from the PATH train to the A/C/E subway line.
Fighter Jets Escort Plane to JFK | | September 11, 2011 | THE DAILY BEAST
Inside, the A/C is on full-blast, pumping out frigid gusts of air.
Hollywood Hits the Desert | Rebecca Dana | November 3, 2009 | THE DAILY BEAST
"M-a-c-a-r-o-n-i," said she, triumphantly, remembering her father's remark that there were no double letters in it.
Marjorie's Busy Days | Carolyn Wells
Well, if it were a foreign name it would probably be Marie B-r-a-c-q—if you are sure you've pronounced it right.
The Sign of Silence | William Le Queux

A complete wave consisting of a condensation and a rarefaction is represented by that portion of the curve A-C.
Physics | Willis Eugene Tower
Long distance, high tension transmission lines are generally three-wire lines carrying three-phase a.-c.
Physics | Willis Eugene Tower
Alternating current is required to ring such a bell and a condenser permits an a.-c.
Physics | Willis Eugene Tower

British Dictionary definitions for ac (1 of 6)

the internet domain name for

Ascension Island

British Dictionary definitions for Ac (2 of 6)

the chemical symbol for

actinium

British Dictionary definitions for AC (3 of 6)

abbreviation for

alternating current: Compare DC
ante Christum

Air Corps
athletic club
Companion of the Order of Australia
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
Aelodau'r Cynulliad: Member of the Assembly (that is, the National Assembly of Wales)

Origin of AC

(for sense 2) Latin: before Christ

British Dictionary definitions for a.c. (4 of 6)

a.c.

/ obsolete /

abbreviation for

(in prescriptions) ante cibum

Origin of a.c.

⁴

Latin: before meals

British Dictionary definitions for a/c (5 of 6)

a/c

/ accounting /

abbreviation for

account
account current

British Dictionary definitions for A/C (6 of 6)

A/C

abbreviation for

(in Canada) Air Commodore

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

Scientific definitions for Ac (1 of 2)

Scientific definitions for AC (2 of 2)

Abbreviation of alternating current

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