an extensive, continuous part of a surface, space, or body

a region of the earth.

Usually, regions. the vast or indefinite entirety of a space or area, or something compared to one

the regions of the firmament; the regions of the mind.

a part of the earth's surface (land or sea) of considerable and usually indefinite extent

a tropical region.

a district without respect to boundaries or extent

a charming region in Connecticut.

a part or division of the universe, as the heavens

a galactic region.

a large indefinite area or range of something specified; sphere

a region of authority.

an area of interest, activity, pursuit, etc.; field

studies in the region of logic.

an administrative division of a city or territory.

Zoogeography . a major faunal area of the earth's surface, sometimes one regarded as a division of a larger area.

Anatomy . a place in or a division of the body or a part of the body

the abdominal region.

Mathematics .

Also called domain. an open connected set.

the union of such a set and some or all of its boundary points.

noun

arena , bailiwick , belt , block , clearing , country , demesne , district , division , domain , dominion , environs , expanse , field , ghetto , ground , inner city , jungle , land , locale , locality , neck of woods , neighborhood , part , place , precinct , province , quarter , range , realm , scene , section , sector , shire , sphere , stomping ground , suburb , terrain , territory , tract , turf * , vicinity , walk , ward , world , zone , area , climate , environment , hemisphere , jurisdiction , kingdom , milieu , purlieu , scope , topography