/ Dictionary / Index B big idea: Meaning and Definition of Find definitions for: big' ide'a Pronunciation: [key] — Informal. Informal. any plan or proposal that is grandiose, impractical, and usually unsolicited: You're always coming around here with your big ideas. purpose; intention; aim: What's the big idea of shouting at me? Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bight big Ike Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language