de·voir 
(dəv-wär, dĕvwär′)
(dəv-wär, dĕvwär′)n.
1. often devoirs An act or expression of respect or courtesy; civility: pay one's devoirs.
2. Duty or responsibility.
[Middle English, duty, from Old French, from devoir, to owe, from Latin dēbēre; see ghabh- in the Appendix of Indo-European roots.]