effort (n.) Look up effort at Dictionary.com
late 15c., from Middle French effort, noun of action from Old French esforz "force, impetuosity, strength, power," back-formation from esforcier "force out, exert oneself," from Vulgar Latin *exfortiare "to show strength" (source of Italian sforza), from Latin ex- "out" (see ex-) + Latin fortis "strong" (see fort).
Effort is only effort when it begins to hurt. [Ortega y Gasset, 1949]
Related: Efforts.