a(ə)ˈrāshən etc ( see aerate ); chiefly substand ˌarēˈā- etc noun
( -s )
1. : the act or process of aerating or the state of being aerated : exposure to air
2. : the process of discharging hot milk or cream through one or more vacuum chambers of a vacuum pasteurizer for elimination of undesirable flavors followed by passage over a surface cooler