Having been done again, especially to improve or fix something that wasn't satisfactory the first time.
From 're-' (again) combined with past participle 'done' (from Old English 'don'). This simple prefix-word combination shows how English's prefix system allows unlimited expansion of meaning.
Redone is interesting because it's both a practical word and a loaded one—'That essay needs to be redone' is neutral, but 'Your whole life needs to be redone' carries judgment. The same word can be purely technical or deeply critical!
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