The Collaborative International Dictionary of English v.0.48:

Plagiarize \Pla"gia*rize\, v. t. [imp. & p. p. Plagiarized; p.
   pr. & vb. n. Plagiarizing.]
   To steal or purloin from the writings of another; to
   appropriate without due acknowledgement (the ideas or
   expressions of another).
   [1913 Webster]

The Devil's Dictionary (1881-1906):

PLAGIARIZE, v.  To take the thought or style of another writer whom
one has never, never read.


Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "plagiarize":
   act like, adopt, affect, appropriate, assume, borrow, chorus,
   come again, copy, counterfeit, crib, derive from, ditto, do,
   do a repeat, do again, do like, do over, double, duplicate, echo,
   fake, forge, go like, hoke, hoke up, imitate, infringe,
   infringe a copyright, make like, make use of, mirror, mock, parrot,
   pirate, quote, redo, redouble, reduplicate, reecho, reflect,
   regurgitate, reincarnate, renew, repeat, reproduce, revive,
   say again, simulate, steal, take, take on, take over