/ Dictionary / Index R rallentando: Meaning and Definition of Find definitions for: ral•len•tan•do Pronunciation: (rä"lun-tän'dōIt.räl"len-tän'dô), [key] — adj. slackening; becoming slower (used as a musical direction). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rallentando (Thesaurus) rall. ralliform Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language