n. 1. Prior date; a date antecedent to another which is the actual date. [ 1913 Webster ]

2. Anticipation. [ Obs. ] Donne. [ 1913 Webster ]

v. t. [ imp. & p. p. Antedated; p. pr. & vb. n. Antedating. ] 1. To date before the true time; to assign to an earlier date; ; thus, to antedate a deed or a bond is to give it a date anterior to the true time of its execution. [ 1913 Webster ]

2. To precede in time. [ 1913 Webster ]

3. To anticipate; to make before the true time. [ 1913 Webster ]

And antedate the bliss above. Pope. [ 1913 Webster ]

Who rather rose the day to antedate. Wordsworth. [ 1913 Webster ]

a. [ Pref. ante- + diluvial. ] Before the flood, or Deluge, in Noah's time. [ 1913 Webster ]

a. Of or relating to the period before the Deluge in Noah's time; hence, antiquated; as, an antediluvian vehicle. -- n. One who lived before the Deluge. [ 1913 Webster ]

prop. n. A genus formerly called genus Comatula.
Syn. -- genus Antedon [ WordNet 1.5 ]

prop. n. A natural family of feather stars; formerly called family Comatulidae.
Syn. -- family Antedonidae [ WordNet 1.5 ]