/ Dictionary / Index M microinstruction: Meaning and Definition of Find definitions for: mi•cro•in•struc•tion Pronunciation: (mī"krō-in-struk'shun), [key] — n. Computers. an instruction that defines part of a machine-language instruction in terms of simpler operations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microinjection microlecithal Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language