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Definition of antedate : 1. Anticipation.
2. Prior date; a date antecedent to another which is the actual date.
3. To anticipate; to make before the true time.
4. To date before the true time; to assign to an earlier date; thus, to antedate a deed or a bond is to give it a date anterior to the true time of its execution.
5. To precede in time.

Synonyms:

give up, foreswear, relinquish, raven, forfeit, dispense with, waive, prey, foredate, forego, accelerate, misdate, forgo, premise, preface, come before, throw overboard

foreshadow, anticipate, predate, introduce, precede, lead, forerun, pioneer, head off, antecede, trail-blaze

Usage examples:

• This vehicle, like the bicycle, is not essentially a modern invention; the reason any one can manufacture it is that practically all the basic ideas antedate 1840. Indeed, the automobile is really older than the railroad. - "Modern American Prose Selections", Various.
• Antedate your papers, I advised, who dare dispute the king? - "Secret Memoirs: The Story of Louise, Crown Princess", Henry W. Fischer.
• Nevertheless the era of the origin of the plays as a rule will be found to antedate that of the manuscripts. - "Some Forerunners of Italian Opera", William James Henderson.