endeavor

[en-dev-er]
verb (used without object)
1.
to exert oneself to do or effect something; make an effort; strive: We must constantly endeavor if we are to succeed.
verb (used with object)
2.
to attempt; try: He endeavors to keep things neat in his apartment.
3.
Archaic. to attempt to achieve or gain.
noun
4.
a strenuous effort; attempt.
Also, especially British, endeavour.


Origin:
1350–1400; Middle English endeveren, from the phrase putten in devoir to make an effort, assume responsibility; compare Anglo-French se mettre en deveir. See en-1, devoir

endeavorer; especially British, endeavourer, noun
preendeavor, noun


1, 2. See try. 4. See effort.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

endeavor
early 15c., lit. "in duty," from phrase put (oneself) in dever "make it one's duty" (a partial translation of O.Fr. mettre en deveir "put in duty"), from O.Fr. dever "duty," from L. debere "to owe" (see debt). One's endeavors meaning one's "utmost effort" is from late 15c.
Related: Endeavored; endeavoring.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Most of these endeavors begin in the spring, making an already busy time of
  year even more hectic.
Appropriate scholarship and service endeavors are expected.
Government is, however, an excellent incubator for risky technology and
  endeavors that private industry shies away from.
The same holds true for other professional endeavors inclusive of law, the
  military, and politics.
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