'AD': [ˌeɪˈdiː]; 'ad': [ˈæd]

WordReference Random House Learner's Dictionary of American English © 2019
ad1 /æd/USA pronunciation   n. [countable]
  1. an advertisement.

adj. [before a noun]
  1. advertising: an ad agency.

A.D. or AD,an abbreviation of
  • PronounsLatin anno Domini : in the year of the Lord;
    since Christ was born (used with dates): Charlemagne was born in a.d. 742.

  • WordReference Random House Unabridged Dictionary of American English © 2019
    ad1  (ad),USA pronunciation n. 
    1. advertisement.
    2. advertising:an ad agency.
    • by shortening 1835–45

    ad2  (ad),USA pronunciation n. [Tennis.]
    1. Sportadvantage (def. 5).
    2. Sportad in, the advantage being scored by the server.
    3. Sportad out, the advantage being scored by the receiver.
    • by shortening 1945–50

    ad3  (ad),USA pronunciation prep. 
    1. (in prescriptions) to;
      up to.
    • Latin

  • a prefix occurring in loanwords from Latin, where it meant "toward'' and indicated direction, tendency, or addition:adjoin.Usually assimilated to the following consonant;
    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

    -ad1  ,
  • a suffix occurring in loanwords from Greek denoting a group or unit comprising a certain number, sometimes of years:dyad; triad.
  • a suffix meaning "derived from,'' "related to,'' "concerned with,'' "associated with'' (oread), introduced in loanwords from Greek (Olympiad; oread), used sporadically in imitation of Greek models, asDunciad,afterIliad.
    • Greek -ad- (stem of -as), specialization of feminine adjective-forming suffix, often used substantively

    -ad2  ,
  • var. of  -ade 1:ballad.

  • -ad3  ,
  • [Anat., Zool.]a suffix forming adverbs from nouns signifying parts of the body, denoting a direction toward that part:dextrad;dorsad;mediad.
    • Latin ad toward, anomalously suffixed to the noun; introduced as a suffix by Scottish anatomist John Barclay (1758–1826) in 1803

    1. Grammaradverb.
    2. Business, advertisement.

    1. active duty.
    2. Pronounsin the year of the Lord;
      since Christ was born:Charlemagne was born in a.d. 742.
      • Latin annō Dominī
    3. art director.
    4. Governmentassembly district.
    5. assistant director.
    6. athletic director.
    7. 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.

    1. after date.
    2. before the day.
      • Latin ante diem
    3. autograph document.

    Collins Concise English Dictionary © HarperCollins Publishers::

    ad /æd/ n
    1. short for advertisement

    AD abbreviation for
    1. (indicating years numbered from the supposed year of the birth of Christ) anno Domini: 70 ad
    Etymology: (sense 4) Latin: in the year of the Lord
    In strict usage, ad is only employed with specific years: he died in 1621 ad, but he died in the 17th century (and not the 17th century ad). Formerly the practice was to write ad preceding the date ( ad 1621), and it is also strictly correct to omit in when ad is used, since this is already contained in the meaning of the Latin anno Domini (in the year of Our Lord), but this is no longer general practice. bc is used with both specific dates and indications of the period: Heraclitus was born about 540 bc; the battle took place in the 4th century bc

    ad- prefix
    1. to; towards: adsorb, adverb
    2. near; next to: adrenal
    Etymology: from Latin: to, towards. As a prefix in words of Latin origin, ad- became ac-, af-, ag-, al-, an-, acq-, ar-, as-, and at- before c, f, g, l, n, q, r, s, and t, and became a- before gn, sc, sp, st

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