/ Dictionary / Index B backdate: Meaning and Definition of Find definitions for: back•date Pronunciation: (bak'dāt"), [key] — -dat•ed, -dat•ing. to date earlier than the actual date; predate; antedate: Backdate the letter so he'll think I wrote it last week. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: backdate (Thesaurus) backcross back dive Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language