IPA: /ˈæn.tɪ.deɪt/
KK: /ˈæntɪˌdeɪt/
A date that is set for an event or document that is earlier than when it actually happens or is created.
The contract had an antedate, making it seem like it was signed months earlier than it really was.
To give a date to something that is earlier than the date it actually happened.
The historian decided to antedate the document to reflect its original creation time.
Past: antedated
Past Participle: antedated
Antedate is formed from "ante-" (meaning before) and "datum" (meaning given or dated). The word refers to something that is dated earlier than the actual date.
Think of 'ante-' meaning 'before' and 'datum' meaning 'given' — so antedate means to give a date that is before the actual date.