/ Dictionary / Index A authenticator: Meaning and Definition of Find definitions for: au•then•ti•ca•tor Pronunciation: (ô-then'ti-kā"tur), [key] — n. a person or thing that authenticates. a code used to authenticate a previously transmitted code. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: authenticator (Thesaurus) authenticate authenticity Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language