/ Dictionary / Index S service mark: Meaning and Definition of Find definitions for: serv'ice mark" Pronunciation: [key] a proprietary term, such as Blue Cross and Blue Shield, American Express, or Planned Parenthood, that is registered with the Patent and Trademark Office. Abbr.: SM Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. serviceman service medal Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language