From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ad- \Ad-\ [A Latin preposition, signifying to. See {At}.]
As a prefix ad- assumes the forms ac-, af-, ag-, al-, an-,
ap-, ar-, as-, at-, assimilating the d with the first letter
of the word to which ad- is prefixed. It remains unchanged
before vowels, and before d, h, j, m, v. Examples: adduce,
adhere, adjacent, admit, advent, accord, affect, aggregate,
allude, annex, appear, etc. It becomes ac- before qu, as in
acquiesce.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
A.D.
adv 1: in the Christian era; used before dates after the
supposed year Christ was born; "in AD 200" [syn: {AD},
{A.D.}, {anno Domini}]
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2013) [vera]:
AD
Active Directory (MS, Windows, AD, DS)
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2013) [vera]:
AD
Analog-to-Digital (D/A), "A/D"
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2013) [vera]:
AD
Authorized Distributor (DEC)
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2013) [vera]:
AD
Autonomous Domain
From Latin-English FreeDict Dictionary ver. 0.1.1 [fd-lat-eng]:
ad
1. at; to; toward; towards
2. until; till
From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:
ad
loudly
From Italian-English FreeDict Dictionary ver. 0.1.1 [fd-ita-eng]:
ad
all of a sudden; suddenly
From Turkish-English FreeDict Dictionary ver. 0.2.1 [fd-tur-eng]:
ad
appellation; name
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