[mahy-kroh-in-struhk-shuh n]

noun Computers.

an instruction that defines part of a machine-language instruction in terms of simpler operations.

Origin of microinstruction

First recorded in 1955–60; micro- + instruction
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for microinstruction



computing an instruction produced within an arithmetic and logic unit in accordance with a microprogram, that activates a particular circuit to perform part of the operation specified by a machine instruction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for microinstruction

1959, from micro- + instruction.

Online Etymology Dictionary, © 2010 Douglas Harper