ad-

aff. a prefix occurring in verbs or verbal derivatives borrowed from Latin, where it meant “toward” and indicated direction, tendency, or addition: adjoin. For variants before a following consonant, see a-, ac-, af-, ag-, al-, an-, ap-, ar-, as-, at-
Etymology: < L ad, ad- (prep. and prefix) to, toward, at, about; c. at I

From formal English to slang. 2014.

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