microinstruction

noun
mi·cro·in·struc·tion | \-ˈstrək-shən \

Definition of microinstruction 

: a computer instruction that activates the circuits necessary to perform a single machine operation usually as part of the execution of a machine-language instruction

First Known Use of microinstruction

1959, in the meaning defined above

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The first known use of microinstruction was in 1959

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