exertion
exert + -ion
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noun
1. physical or mental effort:
努力, 尽力 (!effortよりも骨の折れる努力; → effort) ; 激しい活動
e.g. she was panting with the exertion
e.g. a well-earned rest after their mental exertions.
2. the application of a force, influence, or quality:
(権力などの)行使, 発揮
e.g. the exertion of authority.