Breadcrumb Home > Dictionary > Index O open system: Meaning and Definition of Find definitions for: o'pen sys'tem Pronunciation: [key] — Thermodynam. Thermodynam. a region separated from its surroundings by a boundary that admits a transfer of matter or energy across it. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open string open-timbered 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: apotheosis Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language