(literally) Air that has been heated, especially so as to function as the lifting agent of a hot-air balloon. / (idiomatic) Empty, confused, or exaggerated talk lacking meaning or substance; bluster.

Vehicle suspension in which compressed air is used as a spring.

A device used to remove contaminants from the air.

Alternative form of airtime / The period of freefall after jumping.

Alternative spelling of air conditioner

A machine that is used to control temperature and humidity in an enclosed space.

(chemistry, historical) Oxygen gas, as originally thought to be air deprived of phlogiston (“the hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies and to be given up by them in burning”).

A small pocket of air inside a solid, a liquid or surrounded by a colloid within a larger fluid environment.

A bed that is inflated with air and used as a permanent or temporary bed. They are adjustable, and sometimes portable.

A mattress that is inflated with air, and used as a temporary or permanent bed.