Definition of APPLIANCE

an interesting and often novel device with a practical use <since the invention of the cork, all manner of appliances have been invented for the extraction of these sometimes troublesome stoppers>
something that is not necessary in itself but adds to the convenience or performance of the main piece of equipment <an appliance that allows the machine to be used as a sander>
Synonyms accoutrement (or accouterment), adapter (also adaptor), add-on, adjunct, appendage, appliance, attachment, option

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