Something proper for, or incumbent on, a person to do; one's duty.

That which one ought to do, or has to do; (one's) duty, business, appointed task. (Chiefly in to do one's devoir). archaic.

That which ought to be done; duty; a duty or obligation. See also of due at phrases 1. Now rare (archaic in later use).

Devoir, duty.

A person's particular responsibility, duty, or role. Usually with preceding possessive adjective.