/ Dictionary / Index P power set: Meaning and Definition of Find definitions for: pow'er set" Pronunciation: [key] — Math. Math. the collection of all subsets of a given set. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. power series power shovel Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language