in geography, a large extent of land, inhabited by many people of the same nation, and inclosed within certain limits or bounds.

The modern astronomers divide the moon into several regions, or large tracts of land, to each of which they give its proper name.

in physiology, is taken for a division of our atmosphere, which is divided into the upper, middle, and lower regions.

The upper region commences from the tops of the mountains, and reaches to the utmost limits of the atmosphere. In this region reign a perpetual, equable, calmness, cleanness, and serenity. The middle region is that in which the clouds reside, and where meteors are formed, extending from the extremity of the lowest to the tops of the highest mountains. The lowest region is that in which we breathe, which is bounded by the reflection of the sun's rays; or by the height to which they rebound from the earth. See ATMOSPHERE and AIR.

Aetherial Region, in cosmography, is the whole extent of the universe, in which is included all the heavenly bodies, and even the orb of the fixed stars.

Elementary Region, according to the Aristotelians, is a sphere terminated by the concavity of the moon's orb, comprehending the atmosphere of the earth.

in anatomy, a division of the human body, otherwise called cavity, of which anatomists reckon three, viz. the upper region, or that of the head; the middle region, that of the thorax or breast; and the lower, the abdomen, or belly. See ANATOMY.

in ancient Rome, was a part or division of the city. The regions were only four in number, till Augustus Caesar's time, who divided the city into fourteen; over each of which he settled two surveyors, called curatores viarum, who were appointed annually, and took their divisions by lot. These fourteen regions contained four hundred and twenty-four streets, thirty-one of which were called greater or royal streets, which began at the gilt pillar that stood at the entry of the open place, in the middle of the city. The extent of these divisions varied greatly, some being from 12000 to 33000 feet or upwards in circumference. Authors, however, are not agreed as to the exact limits of each. The curatores viarum wore the purple, had each two lictors in their proper divisions, had slaves under them to take care of fires, that happened to break out. They had also two officers, called demniciatores, in each region, to give account of any disorders. Four vicomagistri also were appointed in each street, who took care of the streets allotted them, and carried the orders of the city to each citizen.