Meaning of “ad” in the English Dictionary

"ad" in British English

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adnoun [ C ]

uk /æd/ us /æd/

ADadverb

uk /ˌeɪˈdiː/ us /ˌeɪˈdiː/

AD adverb (CALENDAR)

abbreviation for Anno Domini: used in the Christian calendar when referring to a year after Jesus Christ was born:

in 1215 AD/AD 1215
during the seventh century AD
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AD noun [ U ] (BRAIN DISEASE)

specialized medical abbreviation for Alzheimer's Disease

(Definition of “ad” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ad" in American English

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adnoun [ C ]

us /æd/

short form ofadvertisement

abbreviation for anno Domini (= in the year of God), used to show that a year is after the year in which Jesus Christ was thought to have been born:

the 12th century A.D.
The Roman empire ended in A.D. 476.
Note: A.D. usually appears before the year and after a century.

(Definition of “ad” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"ad" in Business English

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adnoun [ C ]

uk /æd/ us MARKETING

an advertisement:

an ad for sth He appeared in an ad for fizzy drinks.
take out/place an ad They took out a full-page ad in the newspaper.
The company has been running ads on Spanish-language TV network Telemundo.

adadjective [ only before noun ]

uk /æd/ us

(Definition of “ad” from the Cambridge Business English Dictionary © Cambridge University Press)