/ Dictionary / Index B best-case: Meaning and Definition of Find definitions for: best-case Pronunciation: (best'kās"), [key] — adj. being the best result that could be expected under the circumstances:Cf. The best-case scenario shows her winning the nomination easily. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. best boy bestead Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language