A person who goes or travels to a place, or who participates in or frequents a particular activity or venue (as in 'theater-goer').
From 'go' plus the agent suffix '-er' (one who does something). The suffix '-er' comes from Old English and Proto-Germanic origins, used to create nouns denoting a person who performs an action. 'Goer' has been in English since at least the 16th century.
The '-er' suffix is one of English's most productive word-builders—we can attach it to almost any verb and create a new word for 'someone who does that' (runner, singer, baker), and this principle has shaped English for over a thousand years!
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