Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Microcontroller" Definition
noun
A microcomputer on a single chip, used to control some device such as an automobile engine or a toy.
Source: Wiktionary
A that controls some or all of the functions of an electronic device (as a home appliance) or system.
Source: Merriam-Webster
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