'reveler' originates from Middle English, formed from the verb 'revel' plus the agent suffix '-er', where 'revel' meant 'to take part in noisy festivities' (borrowed from Old French).

'revel' came into Middle English from Old French 'reveler' (verb), meaning 'to make merry'; Middle English formed the agent noun 'reveler', which developed into the modern English 'reveler'.

Initially it meant 'one who takes part in noisy merrymaking'; over time the core meaning has remained, though it can also be used figuratively for someone who greatly enjoys a particular situation.