air conditioning

(noun) a system that keeps air cool and dry. Synonyms: air conditioner, air conditioning.

(verb) control the humidity and temperature of. Synonyms: air-condition. Example: "The room was cool because it had been air-conditioned."

(verb) equip with an apparatus for controlling the humidity and temperature. Synonyms: air-cool, air-condition. Example: "Our house is not air-conditioned."