/ Dictionary / Index M marking pen: Meaning and Definition of Find definitions for: mark'ing pen" Pronunciation: [key] marker (def. 10). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. marking gage markka Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language