Appliance may refer to a device with a narrow function:

• Home appliance, household machines, using electricity or some other energy input.
  • Small appliances
  • Major appliances
• In medicine and dentistry, custom-fitted appliances to an individual for the purpose of correction of a physical or dental problem such as prosthetic, orthotic appliances, and dental braces.
• Computer appliance, a computing device with a specific function and limited configuration ability
• Software appliance, software application combined with just enough operating system (JeOS)
• Fire apparatus, a fire engine or fire truck in British English

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