A small computer that contains a microprocessor as it's central processor.
Microcomputer: Modern desktop computers, video game consoles, laptops, tablet PCs, and many types of handheld devices, including mobile phones, pocket calculators, and industrial embedded systems.
A term used in the 1970s to refer to a computer which was much smaller compared to mainframes at the time, being small enough to fit on a desk. Rendered obsolete by modern computers, which can be far smaller.
The invention of the microprocessor allowed for microcomputers, which were much smaller than computers at the time.