GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Devoir , n. [F., fr. L. debere to owe. See Due.] Duty; service owed; hence, due act of civility or respect; -- now usually in the plural; as, they paid their devoirs to the ladies. “Do now your devoid, young knights!” 
   Chaucer.
   
   1913 Webster