One who experiences; a person or entity that undergoes or perceives an experience.
From 'experience' (verb) plus the agent suffix '-er' (Old English origin, used to create nouns for those who perform an action). In philosophy and linguistics, this term distinguishes the subject having an experience.
Philosophers and linguists use 'experiencer' as a technical term—in the sentence 'Mary enjoys pizza,' Mary is the experiencer because she's the one having the experience. It highlights how grammar reveals who's doing what.
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