/ Dictionary / Index L Lie group: Meaning and Definition of Find definitions for: Lie' group" Pronunciation: (lē), [key] — Math. Math. a topological group that is a manifold. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Liegnitz lie-in Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language