Noun:
* A serious attempt or effort.
* Example: *The team's endeavor to win the championship was impressive.*
Verb:
* To attempt earnestly.
* Example: *She endeavored to finish the project on time.*
Other meanings:
* A project or undertaking, especially one that is difficult or challenging.
* Example: *This new scientific endeavor requires significant funding.*
Synonyms:
* Attempt
* Effort
* Striving
* Venture
* Undertaking
* Pursuit
Antonyms:
* Abandonment
* Neglect
* Surrender
In essence, "endeavor" signifies a determined and dedicated effort directed towards achieving a specific goal.