Breadcrumb Home > Dictionary > Index C closed system: Meaning and Definition of Find definitions for: closed' sys'tem Pronunciation: [key] — Thermodynam. Thermodynam. a region that is isolated from its surroundings by a boundary that admits no transfer of matter or energy across it. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. closed stance closed traverse TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: parallax Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language