'delusion' originates from Latin, specifically the word 'deludere,' where 'de-' meant 'down' and 'ludere' meant 'to play.'

'deludere' transformed into the Old French word 'delusion,' and eventually became the modern English word 'delusion' through Middle English.

Initially, it meant 'to deceive or play falsely,' but over time it evolved into its current meaning of 'a false belief or opinion.'