Etymology
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endeavor (n.)

early 15c., "pains taken to attain an object," literally "in duty," from phrase put (oneself) in dever "make it one's duty" (a partial translation of Old French mettre en deveir "put in duty"), from Old French dever "duty," from Latin debere "to owe," originally, "keep something away from someone," from de- "away" (see de-) + habere "to have" (from PIE root *ghabh- "to give or receive"). One's endeavors meaning one's "utmost effort" is from late 15c.

endeavor (v.)

c. 1400, from phrase put in dever (see endeavor (n.)). Related: Endeavored; endeavoring.

updated on May 27, 2017

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Definitions of endeavor from WordNet
1
endeavor (n.)
a purposeful or industrious undertaking (especially one that requires effort or boldness);
Synonyms: enterprise / endeavour
endeavor (n.)
earnest and conscientious activity intended to do or accomplish something;
wished him luck in his endeavor
Synonyms: attempt / effort / endeavour / try
2
endeavor (v.)
attempt by employing effort;
we endeavor to make our customers happy
Synonyms: endeavour / strive
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.