/ Dictionary / Index P proprietary colony: Meaning and Definition of Find definitions for: propri'etary col'ony Pronunciation: [key] — Amer. Hist. Amer. Hist. any of certain colonies, as Maryland and Pennsylvania, that were granted to an individual or group by the British crown and that were granted full rights of self-government. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. proprietary proprietor Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language