- short for advertisement
WordReference Random House Learner's Dictionary of American English © 2019
- an advertisement.
adj. [before a noun]
- advertising: an ad agency.
A.D. or AD,an abbreviation of
since Christ was born (used with dates): Charlemagne was born in a.d. 742.
- advertising:an ad agency.
- by shortening 1835–45
ad2 (ad),USA pronunciation n. [Tennis.]
- Sportadvantage (def. 5).
- Sportad in, the advantage being scored by the server.
- Sportad out, the advantage being scored by the receiver.
- by shortening 1945–50
ad3 (ad),USA pronunciation prep.
- (in prescriptions) to;
see a-5, ac-, af-, ag-, al-, an- 2, ap-1, ar-, as-, at-.
- Latin ad, ad- (preposition and prefix) to, toward, at, about; cognate with at1
- Greek -ad- (stem of -as), specialization of feminine adjective-forming suffix, often used substantively
- Latin ad toward, anomalously suffixed to the noun; introduced as a suffix by Scottish anatomist John Barclay (1758–1826) in 1803
- Business, advertisement.
- active duty.
- Pronounsin the year of the Lord;
since Christ was born:Charlemagne was born in a.d. 742.
Latin annō Dominī
- art director.
- Governmentassembly district.
- assistant director.
- athletic director.
- average deviation.
- Because anno Domini means "in the year of the Lord,'' its abbreviation a.d. was originally placed before rather than after a date:The Roman conquest of Britain began in a.d. 43 (or began a.d. 43). In edited writing, it is still usually placed before the date. But, by analogy with the position of b.c. "before Christ,'' which always appears after a date (Caesar was assassinated in 44 b.c.), a.d. is also frequently found after the date in all types of writing, including historical works:The Roman emperor Claudius I lived from 10 b.c. to 54 a.d. Despite its literal meaning, a.d. is also used to designate centuries, being placed after the specified century:the second century a.d.
- after date.
- before the day.
Latin ante diem
- autograph document.
- (indicating years numbered from the supposed year of the birth of Christ) anno Domini: 70 ad
- to; towards: adsorb, adverb
- near; next to: adrenal