devoir
Duty, business; something that one must do.
archaic
[…] he imprint not so much in his schollers mind […] where Marcellus died, as because he was unworthy of his devoire he died there[…].
Where it comes from
From Middle English devoir, borrowed from Middle French devoir, from Old French deveir, from Latin dēbēre (“to owe; ought, must”).
Adapted from the Wiktionary entry devoir (CC BY-SA 4.0).