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Invention: A definition and examples Invention is an invention that is not yet known to the public. It can be described as a new way of doing something. There are many types of inventions, such as medical devices, transportation systems, and appliances. A definition for “invention” can be found on the website Merriam-Webster.com. A schematic drawing or model of an invention is also called a “prototype.” Examples of inventions include: the telephone, air conditioning, and automobiles....