As an adjective, it means expected or scheduled to happen at a certain time, or owed to someone as a right or payment. As a noun, it often appears in the plural 'dues', meaning fees or payments that must be made.
From Old French 'deu' meaning 'owed, owing', from Latin 'debitus', past participle of 'debere' meaning 'to owe'. It entered Middle English with the sense of something owed or rightful. The time-related meaning grew from the idea of a debt coming to be paid.
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