- The use of physical or mental energy to do something; exertion.
- A difficult exertion of the strength or will: It was an effort to get up.
- A usually earnest attempt: Make an effort to arrive promptly.
- Something done or produced through exertion; an achievement: a play that was his finest effort.
- Physics. Force applied against inertia.
[Middle English, from Old French esfort, from esforcier, to force, exert, from Medieval Latin exfortiāre : Latin ex-, ex- + Latin fortis, strong.]
effortful ef'fort·ful adj.effortfully ef'fort·ful·ly adv.





