Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • prefix 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.
  • prefix Near; at.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

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

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