air conditioning
US /ˈer kənˌdɪʃ.ən.ɪŋ/
UK /ˈer kənˌdɪʃ.ən.ɪŋ/
1.
a system that controls the humidity, ventilation, and temperature in a building or room to make the occupants more comfortable
:
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The air conditioning unit broke down in the middle of summer.
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It's so hot, I wish we had air conditioning here.