[at-muhs-fer-iks, -feer-]
(used with a plural verb) Radio and Television. noise in a radio receiver or randomly distributed white spots or bands on the screen of a television receiver, caused by interference from natural electromagnetic disturbances in the atmosphere.
(used with a singular verb) the study of such phenomena; sferics.
(used with a plural verb) mood or atmosphere; ambience: The atmospherics of the conference were cordial.

1900–05; see atmospheric, -ics Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atmospherics (ˌætməsˈfɛrɪks)
pl n
1.  electrical disturbances produced in the atmosphere by natural causes such as lightning
2.  radio interference, heard as crackling or hissing in receivers, caused by electrical disturbance

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
atmospherics   (āt'mə-sfîr'ĭks)  Pronunciation Key 
  1. Electromagnetic radiation that is in the same range as radio frequencies and is produced by natural phenomena (such as lightning) and interferes with radio communications.

  2. The radio interference produced by this electromagnetic radiation.

The American Heritage® Science Dictionary
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