antedate /ˈæntiˌdeɪt/verb 3noun 2forms 3 verb3 •To occur before an event or time; to exist further back in time.I suppose you know all about the fearful myths antedating the coming of man to the earth—the Yog-Sothoth and Cthulhu cycles—which are hinted at in the Necronomicon. — 1931 •To assign a date to a document or action earlier than the actual date.Tomorrow when you leav’st, what wilt thou say? / Wilt thou then antedate some new-made vow? — 1633 •To find earlier citational evidence for a term. noun2 •Prior date; a date antecedent to another which is the actual date. •(no longer used) anticipation formsantedated · antedating · antedates