To make an exact copy of something.
From Latin 'duplicare' meaning 'to double', from 'duo' (two) and 'plex' (fold). Over time it came to mean making a second version of something, not just folding it twice.
When you duplicate a file, you’re literally ‘two-folding’ it, just like the Latin roots say. Many English words with 'du-' or 'dup-' hint at 'two' or 'double', like 'dual' and 'duplex'.
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