1. Willful betrayal of fidelity, confidence, or trust; perfidy.
2. The act or an instance of such betrayal.

[Middle English trecherie, from Old French, from trichier, to trick, probably from Vulgar Latin *triccāre. See trick.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.