The Collaborative International Dictionary of English v.0.48:

contemporize \contemporize\ v. i.
   to happen at the same time.

   Syn: co-occur.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

contemporize \contemporize\ v. t.
   to arrange or represent events so that they co-occur.

   Syn: synchronize.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

contemporize
    v 1: happen at the same time [syn: synchronize, synchronise,
         contemporize, contemporise]
    2: arrange or represent events so that they co-occur;
       "synchronize biblical events" [syn: synchronize,
       synchronise, contemporize, contemporise]