Definition of due date noun from the Oxford Advanced Learner's Dictionary

 

due date

 noun
noun
BrE
 
; NAmE
 
[usually singular]
 
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the date on or by which something, especially a sum of money, is owed or expected If payment is not made by the due date, 10% will be added to the bill. a baby’s due date (= when a baby is expected to be born)
See the Oxford Advanced American Dictionary entry: due date