1.nounThe 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. He made a conscious effort to not appear affected by the stories in the paper."
2.nounAn endeavour.
"Although he didn't win any medals, Johnson's effort at the Olympics won over many fans."
3.nounA force acting on a body in the direction of its motion.