B1
the system used for keeping the air in a building or vehicle cool
Dictionary examples:
Our office's air conditioning is so cold, we wear winter coats in summer! (0.0)
I love my job as an air conditioning tester. It's the coolest job ever! (0.0)
The air conditioning in my car is so strong, my ice cream stays frozen! (0.0)
I wish my car had air conditioning. (54.9)