Air-conditioner (noun)

A machine that cools, dehumidifies, and purifies the air in a room or building.

Origin:

From the combination of the words "air" and "conditioner", referring to a device that conditions the air in a room or building.

Examples:

1. She turned on the air-conditioner to cool the room.
2. The air-conditioner was not working, so the room was hot and stuffy.
3. The air-conditioner was a welcome relief on a hot summer day.
4. He had to replace the air-conditioner filter.
5. The air-conditioner hummed softly in the background.