Definition of ad- in English:

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ad-

prefix

1Denoting motion or direction to: advance adduce
1.1Reduction or change into: adapt adulterate
1.2Addition, increase, or intensification: adjunct adhere admixture

Usage

The prefix ad- is also found assimilated in the following forms: a- before sc, sp (ascend, aspire); ac- before c, q (accede, acquire); af- before f (affiliate); ag- before g (aggregate); al- before l (allude); an- before n (annex); ap- before p (appall); ar- before r (arrest); as- before s (assume); at- before t (attend).

Origin

From Latin ad 'to'; in the 16th century the use of ad- and its variants was extended to replace a- from a different origin such as Latin ab- (e.g., advance, from French avancer, based on late Latin abante 'in front').

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