meaning of antedate
1. Prior date; a date antecedent to another which is the actual date.
2. Anticipation.
3. 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.
4. To precede in time.
5. To anticipate; to make before the true time.
6. establish something as being earlier relative to something else