/ Dictionary / Index L LSI: Meaning and Definition of Find definitions for: LSI Pronunciation: [key] — Electronics. Electronics. large-scale integration: the technology for concentrating several thousand semiconductor devices in an integrated circuit. Cf. MSI, SSI, VLSI. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. L-shell L sill Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language