/ Dictionary / Index R reforming: Meaning and Definition of Find definitions for: re•form•ing Pronunciation: (ri-fôr"ming), [key] the process of cracking low-octane petroleum fractions in order to increase the octane number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: reforming (Thesaurus) Reform flask reformist Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language