1. An area, segment, or location in which politics, cultures, or geography are different from other areas: A region can be a part of a country or of the world, etc. that is different or separate from other parts in some way.

Monroe is the sales manage of the California region.

2. A place that is indicated on a person's body or an area that is near a specified part of the body: Henry's mother has a terrible pain in her lower back region.
3. Etymology: from Anglo-French regioun, Old Fremch region; both of which came from Latin regionem and regio, "direction, boundary, district, country"; ultimately from Latin regere, "to direct, to rule".

The geographic area in either hemisphere from which auroral activity can normally be seen; usually, within 30 degrees magnetic latitude from each magnetic pole.

The area of the upper chest surrounding the armpits which are lateral (to the side) of the pectoral (breast or chest) region: Viola had her axillary regions checked by Dr. Jones to see if there was any indication of cancer in that part of her body.

Referring to life that is growing in tundra or polar regions.

The region or area over the gluteal muscles.

The topographical area of the inferior abdomen related to the inguinal canal, lateral to the pubic region (lower central region of the abdomen below the umbilical region).

A division of the earth's surface which includes all marine animals: A marine littoral faunal region is a geographical area of the zoosphere incorporating the entire number of marine creatures.

In geology, a region in which he climatic conditions influence predominant geomorphic processes, imparting to the landscape distinctive regional characteristics that contrast with those of regions influenced by different climatic conditions.

The specialized olfactory receptive area that includes the upper one-third of the nasal septum and the lateral wall above the superior concha and is lined with olfactory mucosa.

Geographical areas that are dominated by great amounts of snow and ice and also consist of vast, dry areas of polar desert because of very small amounts of rainfall: "The polar-region habitats include the Arctic and Antarctic zones with 24-hour periods of daylight in the summer and continuous darkness in the winter."

"Both polar regions provide animal life; including fish and other sea life for the polar bears, seals, penguins, etc."

The region of the back lateral to the vertebral region and between the rib cage and the pelvis.

1. Any of the major geographical areas into which the planet Earth is divided on the basis of distinct forms of animal life or fauna: One zoogeographical region or "zoogeographical realm" is the Australian region, which includes marsupial and monotreme forms, such as the platypus and the echidnas (spiny anteaters) that are not found elsewhere.
2. Nine such regions exist:

• Palaearctic (Northern Europe and Asia)
• Nearctic (North America, Greenland, etc.)
• Ethiopian (Africa and Arabia)
• Madagascan (east coast of Africa)
• Neotropical (Mexico, Central and South America)
• Oriental (India, Burma, and S.E. Asia west of Wallace's Line)
• Australasian (Australia, New Guinea, and islands S.E. Of Wallace's Line)
• New Zealand (including neighboring islands)
• Polynesian (numerous pacific islands of volcanic origin having no apparent connection with the continents)