The whole mass
of aëriform fluid surrounding the earth; -- applied also to the
gaseous envelope of any celestial orb, or other body; as, the
atmosphere of Mars.
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.
In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 
tman breath, soul, G. athem breath) + (?)
sphere: cf. F. atmosphère. See Sphere.]