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English definition of “air conditioning”

air conditioning

noun [U]    
B1 a system that keeps the air cool in a building or car Vents and ventilation
air-conditioned     /ˈeəkənˌdɪʃənd/ adjective having air conditioning : an air-conditioned office Vents and ventilation
(Definition of air conditioning noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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