A person who follows rules, complies with agreements, or stays in a location.
From 'abide' + '-er' (agent suffix). The '-er' suffix transforms the verb into a noun describing someone who performs the action of abiding.
An 'abider' is someone who plays by the rules, but this word is surprisingly rare in modern English—we usually just say 'someone who abides by' something rather than calling them an 'abider'!
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