/ Dictionary / Index W weak interaction: Meaning and Definition of Find definitions for: weak' interac'tion Pronunciation: [key] — Physics. Physics. the interaction between elementary particles and the intermediate vector bosons that carry the weak force from one particle to another. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. weakhearted weakish Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language