Etymology
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endeavour

chiefly British English spelling of endeavor (q.v.); for spelling, see -or. Related: Endeavoured; endeavoring; endeavours. The U.S. space shuttle was spelled this way because it was named for HMS Endeavour, Capt. Cook's ship.

updated on December 16, 2019

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Definitions of endeavour from WordNet
1
endeavour (n.)
a purposeful or industrious undertaking (especially one that requires effort or boldness);
Synonyms: enterprise / endeavor
endeavour (n.)
earnest and conscientious activity intended to do or accomplish something;
Synonyms: attempt / effort / endeavor / try
2
endeavour (v.)
attempt by employing effort;
Synonyms: endeavor / strive
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.