The Collaborative International Dictionary of English v.0.48:
Counterfeit \Coun"ter*feit\, v. t. [imp. & p. p.
Counterfeited; p. pr. & vb. n. Counterfeiting.]
1. To imitate, or put on a semblance of; to mimic; as, to
counterfeit the voice of another person.
Full well they laughed with counterfeited glee
At all his jokes, for many a joke had he.
2. To imitate with a view to deceiving, by passing the copy
for that which is original or genuine; to forge; as, to
counterfeit the signature of another, coins, notes, etc.
Moby Thesaurus II by Grady Ward, 1.0:
24 Moby Thesaurus words for "counterfeiting":
coinage, coining, copying, emulation, fakery, following, forgery,
hit-off, imitation, impersonation, imposture, impression, mimesis,
mintage, mirroring, onomatopoeia, parody, plagiarism, plagiary,
repetition, simulation, stamping, striking, takeoff