Source : Webster's Revised Unabridged Dictionary (1913)

Procrastinate \Pro*cras"ti*nate\, v. t. [imp. & p. p.
   {Procrastinated}; p. pr. & vb. n. {Procrastinating}.] [L.
   procrastinatus, p. p. of procrastinare to procrastinate; pro
   forward + crastinus of to-morrow, fr. cras to-morrow.]
   To put off till to-morrow, or from day to day; to defer; to
   postpone; to delay; as, to procrastinate repentance. --Dr. H.
   More.

         Hopeless and helpless [AE]geon wend, But to
         procrastinate his lifeless end.          --Shak.

   Syn: To postpone; adjourn; defer; delay; retard; protract;
        prolong.

Procrastinate \Pro*cras"ti*nate\, v. i.
   To delay; to be dilatory.

         I procrastinate more than I did twenty years ago.
                                                  --Swift.

Source : WordNet®

procrastinate
     v 1: postpone doing what one should be doing; "He did not want to
          write the letter and procrastinated for days" [syn: {stall},
           {drag one's feet}, {drag one's heels}, {shillyshally},
          {dilly-dally}, {dillydally}]
     2: postpone or delay needlessly; "He procrastinated the matter
        until it was almost too late"