/ Dictionary / Index R reg: Meaning and Definition of Find definitions for: reg Pronunciation: (reg), [key] Usually,regulations. Reg Pronunciation: (rej), [key] a male given name, form of Reg. Pronunciation: [key] regiment. queen. reg. Pronunciation: [key] regent. regiment. region. register. registered. registrar. registry. regular. regularly. regulation. regulator. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. refute regain Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language