/ Dictionary / Index M market order: Meaning and Definition of Find definitions for: mar'ket or"der Pronunciation: [key] an order to buy or sell a specified amount of a security at the best price available. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. market letter marketplace Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language