n.
Pronunciation: -r ē
Function: noun
Inflected Form: plural -er · ies
Etymology: Middle English trecherie, from Anglo-French, from trecher, tricher to deceive, from Vulgar Latin *triccare ― more at TRICK
Date: 13th century
1 : violation of allegiance or of faith and confidence : TREASON
2 : an act of perfidy or treason