History and Etymology
Middle English contencioun "dissension, dispute," borrowed from Anglo-French cuntençun, contencion, borrowed from Latin contentiōn-, contentiō "exertion, competition, conflict," from conten-, variant stem of contendere "to strain, make an effort, strive, compete" + -tiōn-, -tiō, suffix of verbal action — more at contendNOTE: Regarding the variant -ten- with deverbal suffixes beginning in -t- (so contentiō rather than *contensiō), see note at tender entry 3.