köken: Old Swedish forrædheri, likely borrowed from unattested Middle Low German *vorrederie. By surface analysis, förrädare + -eri. Cognate of Danish forræderi, German Verräterei.
köken: Etymology tree Latin perfidus Proto-Indo-European *-yós Proto-Italic *-ios Old Latin -ios Latin -ius Latin -ia Latin perfidia From perfidus + -ia.
köken: First attested in the 14th century. Semi-learned borrowing from Latin trāditiōnem (the suffix in this word indicates a semi-learned form or a formation from trair + -ció; a fully inherited result would have ended in -çó or -ó; compare the similar case of Spanish traición). Doublet of tradició, a later borrowing.
köken: From Old Galician-Portuguese traiçon (13th century, Cantigas de Santa Maria), from Latin traditiō. Doublet of tradición. Cognate with Portuguese traição and Spanish traición.
aile: traizoar, traizoeiro
1350, K. M. Parker (ed.), Historia Troyana. Santiago: Instituto "Padre Sarmiento", page 72
a betrayal; unfaithfulness; a treachery · deliberate, often calculated, disregard for trust or faith · the act of violating the confidence of another, usually for personal gain