From The Collaborative International Dictionary of English v.0.48:
Effort \Ef"fort\, n. [F. effort, OF. esfort, for esfors, esforz, fr. esforcier. See Efforce.] 1. 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. [1913 Webster]
We prize the stronger effort of his power. --Pope. [1913 Webster]
2. (Mech.) A force acting on a body in the direction of its motion. --Rankine.
Syn: Endeavor; exertion; struggle; strain; straining; attempt; trial; essay. See Attempt. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Effort \Ef"fort\, v. t. To stimulate. [Obs.] "He efforted his spirits." --Fuller. [1913 Webster]