the whole mass of aeriform fluid surrounding the earth; -- applied also to the gaseous envelope of any celestial orb, or other body; as, the atmosphere of mars.-any gaseous envelope or medium.-a supposed medium around various bodies; as, electrical atmosphere, a medium formerly supposed to surround electrical bodies.-the pressure or weight of the air at the sea level, on a unit of surface, or about 14.7 ibs. to the sq. inch.-any surrounding or pervading influence or condition.-the portion of air in any locality, or affected by a special physical or sanitary condition; as, the atmosphere of the room; a moist or noxious atmosphere.