The Collaborative International Dictionary of English v.0.48:

Endeavor \En*deav"or\, v. i.
   To exert one's self; to work for a certain end.
   [1913 Webster]

         And such were praised who but endeavored well. --Pope.
   [1913 Webster]

   Note: Usually with an infinitive; as, to endeavor to outstrip
         an antagonist.
         [1913 Webster]

               He had . . . endeavored earnestly to do his duty.
                                                  --Prescott.

   Syn: To attempt; try; strive; struggle; essay; aim; seek.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Endeavor \En*deav"or\, v. t. [imp. & p. p. Endeavored; p. pr.
   & vb. n. Endeavoring.] [OE. endevor; pref. en- + dever,
   devoir, duty, F. devoir: cf. F. se mettre en devoir de faire
   quelque chose to try to do a thing, to go about it. See
   Devoir, Debt.] [Written also endeavour.]
   To exert physical or intellectual strength for the attainment
   of; to use efforts to effect; to strive to achieve or reach;
   to try; to attempt.
   [1913 Webster]

         It is our duty to endeavor the recovery of these
         beneficial subjects.                     --Ld. Chatham.
   [1913 Webster]

   To endeavor one's self, to exert one's self strenuously to
      the fulfillment of a duty. [Obs.] "A just man that
      endeavoreth himself to leave all wickedness." --Latimer.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Endeavor \En*deav"or\, n. [Written also endeavour.]
   An exertion of physical or intellectual strength toward the
   attainment of an object; a systematic or continuous attempt;
   an effort; a trial.
   [1913 Webster]

         To employ all my endeavor to obey you.   --Sir P.
                                                  Sidney.
   [1913 Webster]

   To do one's endeavor, to do one's duty; to put forth
      strenuous efforts to attain an object; -- a phrase derived
      from the Middle English phrase "to do one's dever" (duty).
      "Mr. Prynne proceeded to show he had done endeavor to
      prepare his answer." --Fuller.

   Syn: Essay; trial; effort; exertion. See Attempt.
        [1913 Webster]

WordNet (r) 3.0 (2006):

endeavor
    n 1: a purposeful or industrious undertaking (especially one
         that requires effort or boldness); "he had doubts about the
         whole enterprise" [syn: enterprise, endeavor,
         endeavour]
    2: earnest and conscientious activity intended to do or
       accomplish something; "made an effort to cover all the
       reading material"; "wished him luck in his endeavor"; "she
       gave it a good try" [syn: attempt, effort, endeavor,
       endeavour, try]
    v 1: attempt by employing effort; "we endeavor to make our
         customers happy" [syn: endeavor, endeavour, strive]

Moby Thesaurus II by Grady Ward, 1.0:

151 Moby Thesaurus words for "endeavor":
   accept, accomplished fact, accomplishment, achievement, act, acta,
   action, address, adventure, aim, aim to, apply, approach, aspire,
   assay, assume, attack, attempt, attempt to, be determined, bid,
   blow, buckle down, buckle to, coup, crack, dare to, dealings, deed,
   determine, doing, doings, effort, elbow grease, embark in,
   embark upon, energy, engage in, enter on, enter upon, enterprise,
   essay, exertion, experiment, exploit, fait accompli, fall into,
   fall to, feat, fling, gambit, gest, get under way, go, go about,
   go all out, go at, go in for, go into, go upon, hand, handiwork,
   hard pull, hassle, have at, hump, hump it, intend, job,
   knuckle down, labor, launch forth, launch into, lay about, lay to,
   lick, long pull, make an effort, maneuver, measure, might and main,
   move, move into, muscle, nerve and sinew, offer, operation,
   overt act, pains, passage, performance, pitch into, plunge into,
   ply the oar, pretend to, proceed to, proceeding, production,
   purpose, push, res gestae, resolve, seek, seek to, set about,
   set at, set forward, set going, set to, shot, spare no effort,
   stab, step, strain, strive, strive to, striving, stroke,
   strong bid, struggle, study, study to, stunt, sweat, sweat blood,
   tackle, take on, take up, tentative, thing, thing done, toil,
   tour de force, transaction, travail, trial, trial and error,
   trouble, try, try and, try to, turn, turn to, undertake,
   undertaking, venture, venture to, venture upon, whack, work,
   works



Bouvier's Law Dictionary, Revised 6th Ed (1856):

ENDEAVOR, crim. law. An attempt. (q.v.) Vide Revolt.



U.S. Gazetteer Places (2000):

Endeavor, WI -- U.S. village in Wisconsin
   Population (2000):    440
   Housing Units (2000): 170
   Land area (2000):     0.642079 sq. miles (1.662978 sq. km)
   Water area (2000):    0.059699 sq. miles (0.154620 sq. km)
   Total area (2000):    0.701778 sq. miles (1.817598 sq. km)
   FIPS code:            24075
   Located within:       Wisconsin (WI), FIPS 55
   Location:             43.715813 N, 89.468948 W
   ZIP Codes (1990):     53930
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Endeavor, WI
    Endeavor