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English word effort comes from Old French (842-ca. 1400) esforcier, French esforcier, and later Old French (842-ca. 1400) esfort (Strength; might.)
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esforcier (Old French)
(reflexive, s'esforcier) to try; to attempt. To force (someone to do something). To fortify; to reinforce. To rape. To try; to make a large effort. To use force.
esforcier (French)
esfort (Old French)
Strength; might.
effort (Middle French)
(military) unit; division. Strength; might; force.
effort (English)
A force acting on a body in the direction of its motion.. An endeavour.. The work involved in performing an activity; exertion. (obsolete, transitive) To stimulate.. (uncommon, intransitive) To make an effort.