Due

Due refers to some definite obligation (such as a debt, claim of right, etc.) being owed or payable. It usually means that the debt or claim is immediately enforceable, but it may also mean that it has been unpaid in the past, or will be owed in the future. Overdue refers specifically to the second case, while payable refers to the last case. See also: Due and Owing; Due, Owing, and Unpaid.

Due also means just, proper, and/or reasonable; e.g. due care, due diligence.