NOTE: refers to the effort exerted by someone, not the resulting event, activity (Sense 2)
The human endeavor required to build these pyramids was enormous.
The flowers on your desk was her endeavor to make an apology.
Our team showed real endeavor when they beat the state champions.
WordNet 3.0 Sense Numbers: 1
NOTE: refers to the event, activity, not the energy required for it. (Sense 1)
This fund is known for backing risky endeavors in medical technology.
John made his fortune through a series of successful business endeavors.
He felt the political campaign had been a fruitless endeavor after all.
She excelled in several fields of endeavor. (different disciplines)
WordNet 3.0 Sense Numbers: 2