Source : Webster's Revised Unabridged Dictionary (1913)

Predate \Pre*date"\, v. t.
   To date anticipation; to affix to (a document) an earlier
   than the actual date; to antedate; as, a predated deed or
   letter.

Source : WordNet®

predate
     v 1: be earlier in time; go back further; "Stone tools precede
          bronze tools" [syn: {precede}, {forego}, {antecede}, {antedate}]
          [ant: {postdate}]
     2: come before; "Most English adjectives precede the noun they
        modify" [syn: {precede}]
     3: prey on or hunt for; "These mammals predate certain eggs"
        [syn: {raven}, {prey}]
     4: establish something as being earlier relative to something
        else [syn: {antedate}, {foredate}] [ant: {postdate}]