To endeavour is to strive for something. The endeavour itself is the thing you're striving for, the enterprise or undertaking. It's a primarily British spelling of the word.

The Middle English root of endeavour means to "put oneself in" or "do one's utmost," so if you endeavour to do something, you do it with earnestness and a fair amount of effort. Americans usually spell the word endeavor, but NASA named one of its space shuttles the Endeavour. Why the extra "u"? NASA was honoring the HMS Endeavour, the first ship ever used by the British explorer Captain James Cook.

Definitions of endeavour
  1. noun
    a purposeful or industrious undertaking (especially one that requires effort or boldness)
    synonyms: endeavor, enterprise
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    fraudulent scheme, illegitimate enterprise, racket
    an illegal enterprise (such as extortion or fraud or drug peddling or prostitution) carried on for profit
    forlorn hope
    a hopeless or desperate enterprise
    business activity, commercial activity
    activity undertaken as part of a commercial enterprise
    a business especially one run on a large scale
    the volume of commercial activity
    any enterprise in which losses and gains cancel out
    type of:
    labor, project, task, undertaking
    any piece of work that is undertaken or attempted
  2. noun
    earnest and conscientious activity intended to do or accomplish something
    synonyms: attempt, effort, endeavor, try
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    (baseball) the batter's attempt to get on base
    the supreme effort one can make
    the weakest effort or poorest achievement one is capable of
    bid, play
    an attempt to get something
    crack, fling, go, offer, pass, whirl
    a usually brief attempt
    a tentative attempt
    an initial attempt (especially outside your usual areas of competence)
    contribution, part, share
    the part played by a person in bringing about a result
    the attempt to achieve equal rights or status
    mug's game
    a futile or unprofitable endeavor
    power play, squeeze, squeeze play
    an aggressive attempt to compel acquiescence by the concentration or manipulation of power
    an attempt to acquire or gain something
    shot, stab
    informal words for any attempt or effort
    an attempt to score in a game
    nisus, pains, strain, striving
    an effortful attempt to attain a goal
    battle, struggle
    an energetic attempt to achieve something
    takeover attempt
    an attempt to take control of a corporation
    run, test, trial
    the act of testing something
    test, trial
    the act of undergoing testing
    basketball shot
    throwing the basketball toward the hoop
    bear hug
    a takeover bid so attractive that the directors of the target company must approve it or risk shareholder protest
    proxy fight
    a measure used by an acquirer to gain control of a takeover target; acquirer tries to persuade other shareholders that the management of the target should be replaced
    the part you are expected to play
    any struggle between two skillful opponents (individuals or groups)
    scramble, scuffle
    an unceremonious and disorganized struggle
    a quantitative or qualitative test of a substance (especially an ore or a drug) to determine its components; frequently used to test for the presence or concentration of infectious agents or antibodies etc.
    clinical test, clinical trial
    a rigorously controlled test of a new drug or a new invasive medical device on human subjects; in the United States it is conducted under the direction of the FDA before being made available for general clinical use
    double blind
    a test procedure in which the identity of those receiving the intervention is concealed from both the administrators and the subjects until after the test is completed; designed to reduce or eliminate bias in the results
    preclinical phase, preclinical test, preclinical trial
    a laboratory test of a new drug or a new invasive medical device on animal subjects; conducted to gather evidence justifying a clinical trial
    audition, tryout
    a test of the suitability of a performer
    field trial
    a test of young hunting dogs to determine their skill in pointing and retrieving
    fitting, try-on, trying on
    putting clothes on to see whether they fit
    MOT, MOT test, Ministry of Transportation test
    a compulsory annual test of older motor vehicles for safety and exhaust fumes
    pilot program, pilot project
    activity planned as a test or trial
    jehad, jihad
    a holy struggle or striving by a Muslim for a moral or spiritual or political goal
    a fast shot made with a short powerful swing of the hockey stick
    an attempt to put the soccer ball into the net by using the head
    Snellen test
    a test of visual acuity using a Snellen chart
    joust, tilt
    a combat between two mounted knights tilting against each other with blunted lances
    type of:
    any specific behavior
  3. verb
    attempt by employing effort
    synonyms: endeavor, strive
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    strive, struggle
    exert strenuous effort against opposition
    be at pains, take pains
    try very hard to do something
    to strive with determination
    type of:
    assay, attempt, essay, seek, try
    make an effort or attempt
Word Family

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