/ Dictionary / Index T they'll: Meaning and Definition of Find definitions for: they'll Pronunciation: (āl), [key] contraction of they will. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. they'd they're Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language