Earnest and conscientious activity intended to do or accomplish something:; SYN. effort, endeavor, endeavour, try.
ETYM French effort, Old Fren. esfort, for esfors, esforz, from esforcier. Related to Efforce.
Use of physical or mental energy; hard work; SYN. elbow grease, exertion, travail, sweat.
ETYM Written also endeavour.
(Alternate spelling: endeavour).
Alternate (chiefly British) spelling for endeavor.