/ Dictionary / Index A authenticity: Meaning and Definition of Find definitions for: au•then•tic•i•ty Pronunciation: (ô"then-tis'i-tē, ô"thun-), [key] — n. the quality of being authentic; genuineness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: authenticity (Thesaurus) authenticator authigenic 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