[at-muhs-fer-ik, -feer-]
pertaining to, existing in, or consisting of the atmosphere: atmospheric vapors.
caused by, produced by, or operated on by the atmosphere: atmospheric storms.
resembling or suggestive of the atmosphere; having muted tones and softened or indistinct outlines; hazy: atmospheric effects.
having or producing an emotional atmosphere: atmospheric quality; atmospheric lighting.
Also, atmospherical.

1775–85; atmosphere + -ic

atmospherically, adverb
nonatmospheric, adjective
nonatmospherical, adjective
nonatmospherically, adverb
unatmospheric, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atmosphere (ˈætməsˌfɪə)
1.  troposphere stratosphere mesosphere See also ionosphere the gaseous envelope surrounding the earth or any other celestial body
2.  the air or climate in a particular place: the atmosphere was thick with smoke
3.  a general pervasive feeling or mood: an atmosphere of elation
4.  the prevailing tone or mood of a novel, symphony, painting, or other work of art
5.  a special mood or character associated with a place
6.  any local gaseous environment or medium: an inert atmosphere
7.  at, Abbreviation: atm a unit of pressure; the pressure that will support a column of mercury 760 mm high at 0°C at sea level. 1 atmosphere is equivalent to 101 325 newtons per square metre or 14.72 pounds per square inch

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1783, from atmosphere. In a sense of "creating a mood or mental environment" it is from 1908. Atmospherics "disturbances in wireless communication" is from 1905.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Atmospheric pressure is the weight of the atmosphere overhead.
Today, these gases are used to produce polypropylene, thus drastically reducing
  atmospheric pollution.
Freshly boiled, because long cooking renders it flat and insipid to taste on
  account of escape of its atmospheric gases.
According to climatologists, atmospheric instability eventually influences
  geological stability.
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