Vents and ventilation

air conditioner

air conditioner [noun]

a machine that keeps the air in a building cool

US /ˈer kənˌdɪʃ.ən.ɚ/ 
UK /ˈeə kənˌdɪʃ.ən.ər/ 

Longman Dictionary of Contemporary English

air conditioner

ˈair conˌditioner BrE AmE noun [countable]
a machine that makes the air in a room or building cooler and drier

Oxford Advanced Learner's Dictionary

air conditioner

ˈair conditioner [air conditioner]       noun

a machine that cools and dries air

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

ˈ air con ˌ ditioner noun [ C ]

a machine that keeps the air in a building cool

© Cambridge University Press 2013

Collins COBUILD Advanced Learner’s English Dictionary

air conditioner

 air conditioners
 An air conditioner is a machine which keeps the air in a building cool and dry.(in BRIT, also use air-conditioner)

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

air conditioner


air conditioner noun, pl ~ -ers [count] : a machine that is used to cool and dry the air in a building, room, etc.

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