/ˈɛɹiə/
1.n.a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
“it was a mountainous area”
2.n.a subject of study
“it was his area of specialization”
3.n.a part of an animal that has a special function or is supplied by a given artery or nerve
“in the abdominal region”