to affix a date to (a document, paper, etc) that is earlier than the actual date
2.
to assign a date to (an event, period, etc) that is earlier than the actual or previously assigned date of occurrence
3.
to be or occur at an earlier date than; precede in time
Word Origin and History for pre-date
v.
also predate, 1859, "to antedate, to assign an earlier date to," from pre- + date (n.1) "point in time." As "to exist before," from 1857. Related: Pre-dated; pre-dating.
predate
v.
"to seek prey," 1974, a back-formation from predator, etc. Related: Predated; predating. For the word meaning "antedate; pre-exist," see pre-date.