Wikipedia logo The Simple English Wikipedia has an article on: Device device is on the Academic Word List. Pronunciation IPA (key): /dəˈvaɪs/ Audio (US)(file) Hyphenation: de‧vice Noun Singular device Plural devices Device is on the Academic Vocabulary List. (countable) A device is a small machine or tool. She has a device in her kitchen for cutting garlic. (countable) A device is a machine or part attached to a computer, such as a keyboard, mouse, printer etc. The mouse is an important device for using the computer. (countable) A device is a clever way of doing something. (countable) A device is a logo.Wikiwand - on Seamless Wikipedia browsing. On steroids.