appliancePronunciation: /əˈplʌɪəns/Translate appliance | into French | into German | into Italian | into Spanish Definition of appliance noun 1a device or piece of equipment designed to perform a specific task:electrical and gas appliances 2a fire engine. 3 [mass noun] British the action or process of bringing something into operation:the appliance of science could increase crop yieldsappliance in other Oxford dictionaries Definition of appliance in the US English dictionary