're-enact' originates from the prefix 're-' meaning 'again' and the word 'enact' from Middle English 'enacten', which meant 'to make into law'.

'enacten' transformed into the modern English word 'enact', and with the prefix 're-', it became 're-enact'.

Initially, it meant 'to make into law again', but over time it evolved to include the meaning of 'performing an event again'.