/ Dictionary / Index R registrant: Meaning and Definition of Find definitions for: reg•is•trant Pronunciation: (rej'u-strunt), [key] — n. a person who registers or is registered. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: registrant (Thesaurus) register tonnage registrar Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language