'illusion' originates from Latin, specifically the word 'illusio,' where 'in-' meant 'against' and 'ludere' meant 'to play.'

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

Initially, it meant 'mockery or deception,' but over time it evolved into its current meaning of 'false perception or belief.'