antedate
Pronunciation:
/ˈæntiˌdeɪt/noun
Definitions
Prior date; a date antecedent to another which is the actual date.
Anticipation
verb
Definitions
To occur before an event or time; to exist further back in time.
To assign a date to a document or action earlier than the actual date; to backdate.
To find earlier citational evidence for a term.