due

The definition of due is something that has to be paid or is expected.

(adjective)

Due is defined as something that is deserved or needs to be paid.

(noun)

See due in Webster's New World College Dictionary

adjective

owed or owing as a debt, right, etc.; payable: the first payment is due
suitable; fitting; proper: with all due respect
as much as is required; enough; adequate: due care, in due time
expected or scheduled to arrive or be ready; timed for a certain hour or date: the plane is due at 6:30 P.M.

Origin: ME < OFr deu, pp. of devoir, to owe < L debere, to owe: see debt

adverb

exactly; directly: due west

noun

anything due or owed; specif.,

See due in American Heritage Dictionary 4

adjective

Payable immediately or on demand.
Owed as a debt; owing: the amount still due.
In accord with right, convention, or courtesy; appropriate: due esteem; all due respect.
Meeting special requirements; sufficient: We have due cause to honor them.
a. Expected or scheduled, especially appointed to arrive: Their plane is due in 15 minutes.
b. Expected to give birth.
a. Anticipated; looked for: a long due promotion.
b. Expecting or ready for something as part of a normal course or sequence: We're due for some rain. This batter is due for another hit.
Capable of being attributed. See Usage Note at due to.