| region | | |
| n. (location) | 1. part, region | the extended spatial location of something.; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space" |
| ~ location | a point or extent in space. |
| ~ atmosphere, air | the mass of air surrounding the Earth.; "there was great heat as the comet entered the atmosphere"; "it was exposed to the air" |
| ~ biosphere | the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist. |
| ~ depth | (usually plural) the deepest and most remote part.; "from the depths of darkest Africa"; "signals received from the depths of space" |
| ~ interplanetary space | the part of outer space within the solar system. |
| ~ interstellar space | the space between stars. |
| ~ heliosphere | the region inside the heliopause containing the sun and solar system. |
| ~ intergalactic space | the space between galaxies.; "the Milky Way travels through intergalactic space" |
| ~ deep space | any region in space outside the solar system. |
| ~ aerospace | the atmosphere and outer space considered as a whole. |
| ~ zone | an area or region distinguished from adjacent parts by a distinctive feature or characteristic. |
| ~ belt | an elongated region where a specific condition or characteristic is found.; "a belt of high pressure" |
| ~ bottom | the lowest part of anything.; "they started at the bottom of the hill" |
| ~ county | (United Kingdom) a region created by territorial division for the purpose of local government.; "the county has a population of 12,345 people" |
| ~ distance | a distant region.; "I could see it in the distance" |
| ~ eden, heaven, paradise, shangri-la, nirvana, promised land | any place of complete bliss and delight and peace. |
| ~ extremity | the outermost or farthest region or point. |
| ~ d-layer, d region | the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves. |
| ~ appleton layer, f layer, f region | the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission. |
| ~ e layer, e region, heaviside layer, kennelly-heaviside layer | a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length. |
| ~ hell, hell on earth, hellhole, inferno, snake pit, the pits | any place of pain and turmoil.; "the hell of battle"; "the inferno of the engine room"; "when you're alone Christmas is the pits" |
| ~ inside, interior | the region that is inside of something. |
| ~ ionosphere | the outer region of the Earth's atmosphere; contains a high concentration of free electrons. |
| ~ layer | a relatively thin sheetlike expanse or region lying over or under another. |
| ~ exterior, outside | the region that is outside of something. |
| ~ radius | a circular region whose area is indicated by the length of its radius.; "they located it within a radius of 2 miles" |
| ~ side | a place within a region identified relative to a center or reference location.; "they always sat on the right side of the church"; "he never left my side" |
| ~ air | the region above the ground.; "her hand stopped in mid air"; "he threw the ball into the air" |
| ~ vacuity, vacuum | a region that is devoid of matter. |
| ~ top | the upper part of anything.; "the mower cuts off the tops of the grass"; "the title should be written at the top of the first page" |
| ~ zodiac | a belt-shaped region in the heavens on either side to the ecliptic; divided into 12 constellations or signs for astrological purposes. |
| ~ mansion, planetary house, sign of the zodiac, star sign, sign, house | (astrology) one of 12 equal areas into which the zodiac is divided. |
| ~ achaea | a region of ancient Greece on the north coast of the Peloponnese. |
| ~ doris | a small region of ancient Greece where the Doric dialect was spoken. |
| ~ cynoscephalae | the fields in Thessaly where in 197 BC the Romans defeated the Macedonians. |
| ~ transylvania | a historical plateau region in northwestern Romania that is separated from the rest of the country by the Transylvanian Alps; originally part of Hungary; incorporated into Romania at the end of World War I. |
| ~ papua | the southeastern part of Papua New Guinea. |
| ~ sind | a region of southeastern Pakistan. |
| ~ witwatersrand, reef, rand | a rocky region in the southern Transvaal in northeastern South Africa; contains rich gold deposits and coal and manganese. |
| ~ black hole | a region of space resulting from the collapse of a star; extremely high gravitational field. |
| ~ edgeworth-kuiper belt, kuiper belt | a disk-shaped region of minor planets outside the orbit of Neptune. |
| ~ maria, mare | a dark region of considerable extent on the surface of the moon. |
| n. (body) | 2. area, region | a part of an animal that has a special function or is supplied by a given artery or nerve.; "in the abdominal region" |
| ~ body part | any part of an organism such as an organ or extremity. |
| ~ erogenous zone | any area of the body especially sensitive to sexual stimulation. |
| ~ pressure point | an area on the skin that is highly sensitive to pressure.; "you must know the pressure points in order to administer shiatsu" |
| ~ hypochondrium | the upper region of the abdomen just below the lowest ribs on either side of the epigastrium. |
| ~ area of cardiac dullness | a triangular area of the front of the chest (determined by percussion); corresponds to the part of the heart not covered by the lungs. |
| ~ epigastrium | the region lying on or over the stomach (just below the sternum). |
| ~ fovea, fovea centralis | area consisting of a small depression in the retina containing cones and where vision is most acute. |
| ~ parafovea | area of the retina immediately surrounding the fovea. |
| ~ macula lutea, macular area, macula, yellow spot | a small yellowish central area of the retina that is rich in cones and that mediates clear detailed vision. |
| ~ cortical area, cortical region | any of various regions of the cerebral cortex. |
| ~ perineum | the general region between the anus and the genital organs. |
| ~ side | either the left or right half of a body.; "he had a pain in his side" |
| ~ cleavage | the line formed by a groove between two parts (especially the separation between a woman's breasts). |
| ~ ring of color, areola | small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite. |
| ~ midriff, midsection, middle | the middle area of the human torso (usually in front).; "young American women believe that a bare midriff is fashionable" |
| ~ waist, waistline | the narrowing of the body between the ribs and hips. |
| ~ loins, pubes, pubic region | the lower part of the abdomen just above the external genital organs. |
| ~ palm, thenar | the inner surface of the hand from the wrist to the base of the fingers. |
| ~ thenar | the fleshy area of the palm at the base of the thumb. |
| ~ sole | the underside of the foot. |
| ~ half-moon, lunula, lunule | the crescent-shaped area at the base of the human fingernail. |
| ~ groin, inguen | the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals. |
| ~ quick | any area of the body that is highly sensitive to pain (as the flesh underneath the skin or a fingernail or toenail). |
| n. (location) | 3. region | a large indefinite location on the surface of the Earth.; "penguins inhabit the polar regions" |
| ~ location | a point or extent in space. |
| ~ area, country | 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"; "Bible country" |
| ~ backwater | a place or condition in which no development or progress is occurring.; "the country is an economic backwater" |
| ~ breadbasket | a geographic region serving as the principal source of grain. |
| ~ theater of war, theatre of war | the entire land, sea, and air area that may become or is directly involved in war operations. |
| ~ field of operations, theater of operations, theatre of operations, theater, theatre, field | a region in which active military operations are in progress.; "the army was in the field awaiting action"; "he served in the Vietnam theater for three years" |
| ~ zone of interior | the part of the theater of war not included in the theater of operations. |
| ~ district, territorial dominion, territory, dominion | a region marked off for administrative or other purposes. |
| ~ demesne, domain, land | territory over which rule or control is exercised.; "his domain extended into Europe"; "he made it the law of the land" |
| ~ old world | the regions of the world that were known to Europeans before the discovery of the Americas. |
| ~ far east | a popular expression for the countries of eastern Asia (usually including China and Mongolia and Taiwan and Japan and Korea and Indochina and eastern Siberia). |
| ~ northland | any region lying in or toward the north. |
| ~ southland | any region lying in or toward the south. |
| ~ field | somewhere (away from a studio or office or library or laboratory) where practical work is done or data is collected.; "anthropologists do much of their work in the field" |
| ~ geographic area, geographic region, geographical area, geographical region | a demarcated area of the Earth. |
| ~ biogeographical region | an area of the Earth determined by distribution of flora and fauna. |
| ~ heartland | the central region of a country or continent; especially a region that is important to a country or to a culture. |
| ~ irredenta, irridenta | a region that is related ethnically or historically to one country but is controlled politically by another. |
| ~ antipodes | any two places or regions on diametrically opposite sides of the Earth.; "the North Pole and the South Pole are antipodes" |
| ~ terra incognita, unknown, unknown region | an unknown and unexplored region.; "they came like angels out the unknown" |
| ~ testing ground, laboratory | a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation.; "the new nation is a testing ground for socioeconomic theories"; "Pakistan is a laboratory for studying the use of American troops to combat terrorism" |
| ~ occident, west | the countries of (originally) Europe and (now including) North America and South America. |
| ~ french west indies | the islands in the Lesser Antilles that are administered by France. |
| n. (quantity) | 4. neighborhood, region | the approximate amount of something (usually used prepositionally as in `in the region of').; "it was going to take in the region of two or three months to finish the job"; "the price is in the neighborhood of $100" |
| ~ indefinite quantity | an estimated quantity. |
| n. (cognition) | 5. realm, region | a knowledge domain that you are interested in or are communicating about.; "it was a limited realm of discourse"; "here we enter the region of opinion"; "the realm of the occult" |
| ~ knowledge base, knowledge domain, domain | the content of a particular field of knowledge. |
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