'reexperience' originates from the prefix 're-' meaning 'again' and the word 'experience' from Latin 'experientia', meaning 'trial, experiment'.

'experientia' transformed into the Old French word 'experience', and eventually became the modern English word 'experience'. The prefix 're-' was added to form 'reexperience'.

Initially, 'experience' meant 'trial or experiment', but over time it evolved to mean 'undergoing or living through an event'. 'Reexperience' retains the core meaning of experiencing again.