air conditioner

an air-conditioning device.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
air conditioning
a system or process for controlling the temperature and sometimes the humidity and purity of the air in a house, etc
air conditioner

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

air conditioner
from air (1) + agent n. from condition; along with air-conditioning, first attested 1909, originally an industrial process; main modern use in residences and office buildings is from 1930s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Keep those fans buzzing in summer instead of turning on the air conditioner.
If only a nuclear bomb could generate electricity, run an air conditioner or
  light a study lamp.
Imagine your heater talking to your air conditioner and your room lighting.
When you are too hot you turn on the air conditioner when too cold the heat.
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