'attendee' originates from the verb 'attend,' which comes from the Old French word 'atendre,' meaning 'to wait for' or 'to expect.'

'attendre' transformed into the Middle English word 'attenden,' and eventually became the modern English word 'attend,' from which 'attendee' is derived.

Initially, 'attend' meant 'to wait for' or 'to expect,' but over time it evolved to mean 'to be present at an event,' leading to the noun form 'attendee.'