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Synonyms

ac

1 American  

abbreviation

  1. acre; acres.


Ac 2 American  

abbreviation

Chemistry.
  1. acetate.

  2. acetyl.


Ac 3 American  
Symbol, Chemistry.
  1. actinium.


AC 4 American  

abbreviation

Electricity.
  1. alternating current.


A/C 5 American  
[ey-see] / ˈeɪˈsi /
Also AC, or a/c

abbreviation

  1. air conditioning.


A/C 6 American  
Or a/c

abbreviation

Bookkeeping.
  1. account.

  2. account current.


ac- 7 American  
  1. variant of ad- before c and qu: accede; acquire.


-ac 8 American  
  1. variant of -ic after Greek noun stems ending in i: cardiac; maniac.


a.c. 9 American  

abbreviation

  1. (in prescriptions) before meals.


A.C. 10 American  

abbreviation

  1. before Christ.


A.C. 11 American  

abbreviation

  1. Army Corps.

  2. Athletic Club.


a.c. 1 British  

abbreviation

  1. (in prescriptions) ante cibum

"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

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)

"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

ac 3 British  

abbreviation

  1. Ascension Island

"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

A/C 4 British  

abbreviation

  1. 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

a/c 5 British  

abbreviation

  1. account

  2. account current

"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

Ac 6 British  

symbol

  1. actinium

"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

AC Scientific  
  1. Abbreviation of alternating current


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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

He told her to "put 120£ in this ac… please thank u baby".

From BBC Jul. 13, 2026

He was a very well-known, established character ac even before "I Love Lucy."

From Fox News Jun. 5, 2021

Comparing not having A/C to 100 years ago when there was no ac is not a fair comparison.

From New York Times Aug. 15, 2016

Centripetal force Fc is always perpendicular to the path and pointing to the center of curvature, because ac is perpendicular to the velocity and pointing to the center of curvature.

From Textbooks Aug. 12, 2015

Ngawang Doka replied in clear, sparkling English that carried a hint of a Canadian ac cent.

From "Into Thin Air" by Jon Krakauer

No attorney is listed on court documents for Balcarcel Ac.

From Seattle Times Jul. 8, 2022

Both men are being held in local jails, Balcarcel Ac in Charlottesville and Alvarado-Dubon in Richmond.

From Seattle Times Jul. 8, 2022

Even to copy a relatively short paper, “Proc Nat Ac Sci”—“Proceedings of the National Academy of Sciences”—could take the better part of an hour.

From The New Yorker Jan. 6, 2020

Actinium, Ac, is the first member of the fourth transition series, which also includes Rf through Rg.

From Textbooks Feb. 14, 2019

Ac nelle ich Castel ne Borh; nanne þe bi take.

From Selections from early Middle English, 1130-1250 Part I: Texts by Hall, Joseph

Four of the squad won the helped Paris St-Germain win the past two Champions League titles - left-back Nuno Mendes, midfielders Vitinha and Joao Neves and striker Goncalo Ramos, who joined AC Milan this summer.

From BBC Jul. 6, 2026

Italy international Tonali joined Newcastle from AC Milan for £55m in July 2023.

From BBC Jul. 6, 2026

After driving so many years without AC, Reyez says he is surprised how much even a few minutes at a time keeps fatigue away.

From The Wall Street Journal Jul. 3, 2026

"It was 42-45 degrees in India when we left but everywhere there is AC," said Rajasekhar, on a two-week trip to Europe with his wife and their two teenage children.

From Barron's Jun. 30, 2026

“I should have gotten AC in here years ago,” he said.

From "Storm Runners" by Roland Smith

The first statement shows a payment was sent to a Barclays account where Reinaldo Avila da Silva is named as "A/C", typically an abbreviation for account.

From BBC Feb. 2, 2026

You’re cruising down the 101 Freeway in 2050, A/C cranking and music blaring, when you spot a relic from another era: a late 2020s crossover SUV.

From Los Angeles Times Sep. 9, 2024

If what comes out when we look at the A/C circles entails the representation of the form of the conclusion, BOOM, the argument is valid.

From Salon Jul. 29, 2024

I much enjoyed the juicy, clearly local heirloom tomatoes, one of the good things about too-hot days, best enjoyed with a friend in a fancyish lounge with drinks and A/C.

From Seattle Times Aug. 24, 2023

Roy waited inside for a while, but without A/C it was unbearably hot and sticky.

From "Hoot" by Carl Hiaasen

Still, with the prices of many commodities climbing, the companies couldn’t ac- commodate price shocks, so they often  wound  up hiring banks to hedge their vulnerability to volatile product markets.

From MSNBC Jun. 4, 2014

“I suppose the problem at the moment is that we don’t have a one- to-one mapping, because even our best theories aren’t completely ac- curate,” Ladyman said.

From Scientific American Jan. 31, 2014

The government has devised civic ac- tion programs to rebuild damaged hamlets, and anti-guerrilla patrols are often accompanied by doctors who bring free medical care to the hill people.

From Time Magazine Archive

She is all that is artistic without being vulgar and is the one ac- tress today who can wink without being suggestive.

From Time Magazine Archive

NOTE.—The forms ac-, af-, etc., are euphonic variations of ad-, and follow generally the rule that the final consonant of the prefix assimilates to the initial letter of the root.

From New Word-Analysis by William Swinton

NOTE.—The suffix -ac is found only in Latin derivatives of Greek origin.

From New Word-Analysis by William Swinton

A new report finds that about 3% of autos--high- and low-end models--have fungi and bacteria breeding in the moisture that collects on the a.c.

From Time Magazine Archive

Power.—A transformer for stepping down a commercial alternating current for lighting and heating the filament and for stepping up the commercial a.c., for charging the plate of a vacuum tube oscillator.

From The Radio Amateur's Hand Book by Collins, A. Frederick (Archie Frederick)

These writings are said to date from about 97 to 150 a.c.

From Frauds and Follies of the Fathers A Review of the Worth of their Testimony to the Four Gospels by Wheeler, Joseph Mazzini

In the third century a.c. he composed in Greek a history of his native land, which has perished.

From Myths of Babylonia and Assyria by Mackenzie, Donald Alexander

The 60 h.p. has parallel a.c. cylinders, the other two are radial w.c.

From Jane's All the World's Aircraft 1913 by Various

Other historical Pasadena figures in the book include the bookseller A.C.

From The Wall Street Journal Feb. 27, 2026

His gardening business began by accident in 1979, when he began volunteering at the A.C.

From Los Angeles Times May 19, 2025

But the filmmaking team is fairly confident it belongs to Irvine, due to the sock found inside the boot being embroidered with the words "A.C. Irvine".

From BBC Oct. 11, 2024

Other students, not so much — they were stuck in older dorms without A.C.

From New York Times Jun. 19, 2024

Sir Horace was for the moment an A.C. commander without an A.C., the remnants of his six heroic brigades being scattered here and there along the whole front.

From The First Seven Divisions Being a Detailed Account of the Fighting from Mons to Ypres by Hamilton, Ernest W.

Chris Coucheron-Aamot, a guest at the Sandals resort, wrote on Facebook that the cause of the episode “may have been a fault with the a/c in the unit, causing a toxic coolant leak.”

From Seattle Times May 9, 2022

If that power comes from fossil fuels, a/c alone will account for a half-degree Celsius rise in global temperatures.

From The Guardian Aug. 11, 2019

People with no a/c had access to open windows and the wind.

From New York Times Aug. 15, 2016

Everyone drives huge SUVs, the houses have no insulation, heating on all winter, a/c on all summer, landfills are overflowing, you get punished for reusing shopping bags.

From BBC Jul. 10, 2011

Curry wrote asking what price I placed on my right to the books, and I replied demanding a full a/c of all sales up to date.

From Charles Lever, His Life in His Letters, Vol. I by Downey, Edmund

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