antedate

verb (used with object), an·te·dat·ed, an·te·dat·ing.

1. to be of older date than; precede in time: The Peruvian empire antedates the Mexican empire.
2. predate(def 1).
3. to assign to an earlier date: to antedate a historical event.
4. to cause to return to an earlier time: to antedate one’s thoughts by remembering past events.
5. to cause to happen sooner; accelerate: The cold weather antedated their departure from the country.
6. Archaic. to take or have in advance; anticipate.

noun

7. a prior date.

verb (ˈæntɪˌdeɪt, ˌæntɪˈdeɪt) (tr)

1. to be or occur at an earlier date than
2. to affix a date to (a document, etc) that is earlier than the actual date
3. to assign a date to (an event, etc) that is earlier than its previously assigned date
4. to cause to occur sooner

noun (ˈæntɪˌdeɪt)

5. an earlier date