n. The aëriform fluid which surrounds the earth, and extends to an undetermined height above its surface; the air.n. A conventional unit of atmospheric pressure.n. The gaseous envelop surrounding any of the heavenly bodies.n. Any gaseous medium: as, “an atmosphere of cold oxygen,” Miller.n. An assumed outer envelop of force, effluvia, etc., surrounding a body: as, an electrical atmosphere.n. Figuratively, intellectual or moral environment; pervading influence.