- A force acting on a body in the direction of its motion.
- An endeavour.
"Although he didn't win any medals, Johnson's effort at the Olympics won over many fans."
- The work involved in performing an activity; exertion.
"It took a lot of effort to find a decent-sized, fully-furnished apartment within walking distance of the office."
- (obsolete, transitive) To stimulate.
- (uncommon, intransitive) To make an effort.