/ Dictionary / Index A all-in: Meaning and Definition of Find definitions for: all-in Pronunciation: (ôl'in'), [key] — adj. without restrictions; with virtually every type of hold permitted. performed by all members of the group; played ensemble: An all-in refrain followed the solos. with extras included; inclusive: at the all-in rate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: all-in (Thesaurus) all-important all-inclusive Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language