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Definition of effort : 1. A force acting on a body in the direction of its motion.
2. An exertion of strength or power, whether physical or mental, in performing an act or aiming at an object; more or less strenuous endeavor; struggle directed to the accomplishment of an object; as, an effort to scale a wall.
3. To stimulate.

Synonyms:

reason, run, striving, acquisition, parturiency, safari, childbed, hunting expedition, while, sweat, lawsuit, driving, swither, force, accomplishment, parkway, pain, motility, industry, drift, battle, stress, try, trial, push, energy, take, perspiration, labour, tug, lying-in, crack, cause, trouble, apparent motion, ride, lather, suit, campaign, spurt, discipline, trend, offer, training, fret, bm, military campaign, acquirement, drill, causal agent, do, attainment, driving force, move, bid, bowel movement, pull, whirl, grounds, application, stab, struggle, carelessness, causal agency, attack, stew, achievement, strain, travail, case, drive, thrust, private road, apparent movement, stretch, political campaign, confinement, resolution, feat, heavy, go, front, shot, endeavour, tension, driveway, social movement, crusade, ease, sudor, causa, elbow grease

labor, motion, action, behavior, enterprise, activity, exercise, endeavor, conduct, operation, deed, performance, practice, movement

onerousness, exertion, toil, strenuousness

employment, task, work, occupation, chore

contract, gambit, aim, production, project, job, commitment, exploit, undertaking, approach, engagement, maneuver, purpose, attempt, proceeding, venture, assay, adventure, essay

Usage examples:

• It had cost him real effort to close the doors of his heart against her. - "An Alabaster Box", Mary E. Wilkins Freeman and Florence Morse Kingsley.
• But the driver made the effort. - "Way of the Lawless", Max Brand.
• I look upon this Play as an effort in this direction, which I trust may be followed by many more. - "The Saint's Tragedy", Charles Kingsley.