The Collaborative International Dictionary of English v.0.48:

Synchronize \Syn"chro*nize\, v. i. [imp. & p. p. Synchronized;
   p. pr. & vb. n. Synchronizing.] [Gr. ?.]
   To agree in time; to be simultaneous.
   [1913 Webster]

         The path of this great empire, through its arch of
         progress, synchronized with that of Christianity. --De
                                                  Quincey.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Synchronize \Syn"chro*nize\, v. t.
   1. To assign to the same date or period of time; as, to
      synchronize two events of Greek and Roman history.
      "Josephus synchronizes Nisan with the Egyptian Pharmus."
      --W. L. Bevan.
      [1913 Webster]

   2. To cause to agree in time; as, to synchronize the
      movements of different machines; to synchronize clocks.
      [1913 Webster]

WordNet (r) 3.0 (2006):

synchronize
    v 1: make synchronous and adjust in time or manner; "Let's
         synchronize our efforts" [syn: synchronize,
         synchronise, sync] [ant: desynchronise,
         desynchronize]
    2: happen at the same time [syn: synchronize, synchronise,
       contemporize, contemporise]
    3: make (motion picture sound) exactly simultaneous with the
       action; "synchronize this film" [syn: synchronize,
       synchronise]
    4: arrange or represent events so that they co-occur;
       "synchronize biblical events" [syn: synchronize,
       synchronise, contemporize, contemporise]
    5: operate simultaneously; "The clocks synchronize" [syn:
       synchronize, synchronise]
    6: cause to indicate the same time or rate; "synchronize your
       watches" [syn: synchronize, synchronise]