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