Main Entry:

air–con·di·tion

Pronunciation:

\ˌer-kən-ˈdi-shən\

Function:

transitive verb

Etymology:

back-formation from air conditioning

Date:

1933

: to equip (as a building) with an apparatus for washing air and controlling its humidity and temperature ; also : to subject (air) to these processes

— air conditioner noun

— air–con·di·tion·ing \-ˈdi-sh(ə-)niŋ\ noun