Pronunciation: (ô-then'ti-kāt"), [key]
—v.t., -cat•ed, -cat•ing.
1. to establish as genuine.
2. to establish the authorship or origin of conclusively or unquestionably, chiefly by the techniques of scholarship: to authenticate a painting.
3. to make authoritative or valid.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.