Effort (noun)

1. Exertion of physical or mental power to do or achieve something.
2. A particular attempt or exertion.

Origin:

From the middle english "efort" and old french "esforz" meaning "force, power, or exertion" which comes from the latin word "exfortare" meaning "to strengthen or to build up". it first appeared in english in the 14th century.

Examples:

1. She made a great effort to finish the race.
2. He put a lot of effort into his studies.
3. It took a lot of effort to lift the heavy weight.
4. The company made a big effort to improve its image.
5. Despite his best effort, he was unable to complete the task.