/ Dictionary / Index E expansion team: Meaning and Definition of Find definitions for: expan'sion team" Pronunciation: [key] — Sports. Sports. a new team in a league, composed largely of players from established league teams and formed when the league expands its membership. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. expansion slot expansion wave Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language