/ Dictionary / Index T topological group: Meaning and Definition of Find definitions for: top'olog'ical group' Pronunciation: [key] — Math. Math. a set that is a group and a topological space and for which the group operation and the map of an element to its inverse are continuous functions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. topological equivalence topological invariant Related Content Daily Word Quiz: abdicate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language