American Dictionary of the English Language

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TREACHERY, noun trech'ery. Violation of allegiance or of faith and confidence. The man who betrays his country in any manner, violates his allegiance, and is guilty of treachery This is treason. The man who violates his faith pledged to his friend, or betrays a trust in which a promise of fidelity is implied, is guilty of treachery The disclosure of a secret committed to one in confidence, is treachery This is perfidy.