Air-conditioning
1. - pass (a liquid, gas, light, or sound) through a device to remove unwanted material.
2. - the provision of fresh air to a room, building, etc..
3. - a system for controlling the humidity, ventilation, and temperature in a building or vehicle, typically to maintain a cool atmosphere in warm conditions.
Filter
1. - pass (a liquid, gas, light, or sound) through a device to remove unwanted material.
2. - the provision of fresh air to a room, building, etc..
3. - a system for controlling the humidity, ventilation, and temperature in a building or vehicle, typically to maintain a cool atmosphere in warm conditions.
Ventilation
1. - pass (a liquid, gas, light, or sound) through a device to remove unwanted material.- the provision of fresh air to a room, building, etc..
2. - the provision of fresh air to a room, building, etc..
3. - a system for controlling the humidity, ventilation, and temperature in a building or vehicle, typically to maintain a cool atmosphere in warm conditions.

Listen. Match the definitions to the words!