Definition of ad- in English:

ad-

prefix

1Denoting motion or direction to: advance adduce
1.1Denoting reduction or change into: adapt adulterate

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').

Usage

Ad- is also found assimilated in the following forms: a- before sc, sp, st; ac- before c, k, q; af- before f; ag- before g; al- before l; an- before n; ap- before p; ar- before r; as- before s; at- before t.

Definition of ad- in:

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Pronunciation: ˈdīktik
adjective
denoting a word whose meaning depends on context...