|Noah Webster's Dictionary|
(adv.) In a due, fit, or becoming manner; as it (anything) ought to be; properly; regularly.
Duly (2 Occurrences)
Galatians 3:15 Brothers, speaking of human terms, though it is only a man's covenant, yet when it has been confirmed, no one makes it void, or adds to it. (See NIV)
Ezekiel 44:20 Neither shall they shave their heads, nor suffer their locks to grow long: they shall duly poll their heads. (DBY)