The Collaborative International Dictionary of English v.0.48:

acetylate \acetylate\ v. i.
   1. (Chem.) receive substitution of an acetyl group; of
      chemical compounds

   Syn: acetylize
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

acetylate \acetylate\ v. t. (Chem.) 1
   introduce an acetyl group into a chemical compound

   Syn: acetylize
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

acetylate
    v 1: receive substitution of an acetyl group; "the compounds
         acetylated" [syn: acetylate, acetylize, acetylise]
    2: introduce an acetyl group into (a chemical compound) [syn:
       acetylate, acetylize, acetylise]