Ad- - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

ad-

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-.

[Origin: < L ad, ad- (prep. and prefix) to, toward, at, about; c. at¹

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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American Heritage Dictionary - Cite This Source - Share This

ad-
pref.

ac- or af- or ag- or al- or ap- or as- or at- Toward; to. Before c, f, g, k, l, p, q, s, and t, ad- is usually assimilated to ac-, af-, ag-, ac-, al-, ap-, ac-, as-, and at-, respectively.
Near; at: adrenal.

[Latin, from ad, to; see ad- in Indo-European roots.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
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Online Etymology Dictionary - Cite This Source - Share This
ad-

prefix expressing direction toward or in addition to, from L. ad "to toward," from PIE *ad- "to, near, at" (cognate with O.E. æt "at"). Simplified to a- before sc-, sp- and st-; modified to ac- before many consonants and then re-spelled af-, ag-, al- etc., in conformity with the following consonant (e.g. affection, aggression). In O.Fr., reduced to a- in all cases, but written forms were refashioned after L. in 14c. in Fr., and 15c. in Eng. words picked up from O.Fr. In many cases pronunciation followed the shift.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

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.

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