Webster's Revised Unabridged Dictionary · 1913

Antedate

Antedate (an`te*dāt`) , noun

1.
Prior date; a date antecedent to another which is the actual date.
2.
Anticipation. [Obsolete] — Donne

Antedate (an`te*dāt`) , transitive verb

1.
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.
2.
To precede in time.
3.
To anticipate; to make before the true time.
And antedate the bliss above. — Pope
Who rather rose the day to antedate. — Wordsworth