As an adjective, it means two times as much, or made of two similar parts. As a noun, it can mean a copy or look-alike, or a portion that is twice the usual size. As a verb, it means to make or become twice as large.
From Old French 'doble', from Latin 'duplus' meaning 'twofold', from 'duo' meaning 'two'. It entered Middle English with the sense of 'two of the same'. The idea of copying or mirroring grew naturally from the idea of having two.
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