One that closely imitates or mimics another.
To act as an imitator or mimic.
To imitate closely; mimic.
Closely imitating or following another: a copycat version of a successful product; a copycat crime.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.