Origin: 1350–1400; ME endeveren, from the phrase putten in devoir to make an effort, assume responsibility
1. to exert oneself to do or effect something; make an effort; strive: We must constantly endeavor if we are to succeed.
–verb (used with object)
2. to attempt; try: He endeavors to keep things neat in his apartment.
3. Archaic. to attempt to achieve or gain.
4. a strenuous effort; attempt.
Also, especially British, en·deav·our.