This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A conscientious or concerted effort toward an end; an earnest attempt.

n. Purposeful or industrious activity; enterprise.

v. To attempt (fulfillment of a responsibility or an obligation, for example) by employment or expenditure of effort: endeavored to improve the quality of life in the inner city.

verb-intransitive. To work with a set or specified goal or purpose.

n. A sincere attempt. A determined or assiduous effort towards a specific goal.

n. Enterprise; assiduous or persistent activity.

v. To attempt through application of effort.

v. To work with purpose.

v. 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.

verb-intransitive. To exert one's self; to work for a certain end.

n. An exertion of physical or intellectual strength toward the attainment of an object; a systematic or continuous attempt; an effort; a trial.

To put, apply, or exert (one's self) to do a thing: used reflexively.

To attempt to gain; try to effect; strive to achieve or attain; strive after.

To labor or exert one's self to do or effect something; strive; try; make an effort: followed by an infinitive.

To direct one's efforts or labor toward some object or end; fix one's course; aim: with at, for, or after.

Synonyms Undertake, Endeavor, etc. (see attempt); to seek, aim, struggle.

n. An effort; an essay; an attempt; an exertion of physical or mental powers toward the attainment of an object.

n. Synonyms Struggle, trial.

v. attempt by employing effort

n. a purposeful or industrious undertaking (especially one that requires effort or boldness)

n. earnest and conscientious activity intended to do or accomplish something

"If the endeavor is a group project, the letter should describe in specific terms what the student did and any results from the student's actions."

endeavors   

to do one's endeavor   

endeavored    endeavoring   

try    attempt    strive    aim    struggle    essay    seek    exertion    effort    trial   

Trevor    bever    clever    endeavour    ever    forever    haver    however    kever    lever   

endeavors    endeavour    undertake    aspiration    exertion    venture    enterprise    devotion    strive    achievement