The meaning of ENDEAVOR is to attempt (something, such as the fulfillment of an obligation) by exertion of effort. How to use endeavor in a sentence. Synonym Discussion of Endeavor . Endeavour definition: to try (to do something). See examples of ENDEAVOUR used in a sentence. Endeavour is a formal word for trying very hard to do something or an attempt to do something new or original. Learn how to use it as a verb or a noun, and see synonyms and examples from Collins Dictionary. Endeavour is a formal word for trying very hard or making an attempt to do something new or difficult. It can be a verb or a noun, and it has different spellings in British and American English.
