Dictionary.net

Exertion of one's ability, physical or intellectual, toward the attainment of an object; effort; exertion.

To make an attempt to gain; to try to effect or achieve.

To make it our duty to do a thing; to exert strength either of body or mind for the accomplishment of a purpose; to attempt; to try.

An exertion of strength, physical or mental, towards some end; effort; an attempt. I shall do my endeavour, implying duty, means, I shall make an effort.

n. [French] A patting forth of one’s power for some specific end; on attempt or trial; effort; exertion; essay.

Labour directed to some certain end.

To labour to a certain purpose.

To attempt, to try.