'miraculous' originates from Latin, specifically the word 'miraculosus', where 'miraculum' meant 'wonder'.

'miraculosus' passed into Old French as 'miraculeux' and into Middle English, eventually becoming the modern English word 'miraculous'.

Initially it meant 'full of wonder' or 'causing wonder'; over time it has largely retained that sense but also came to describe events attributed to miracles.