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Definition of Triple point
1. Noun. (physics) The unique temperature and pressure at which the solid, liquid and gas phases of a substance are all in equilibrium. ¹
¹ Source: wiktionary.com
Medical Definition of Triple point
1. The temperature at which all three phases (i.e., solid, liquid, and gas) are in equilibrium; the triple point of water (273.16 K) is a fundamental fixed point in temperature scales. (05 Mar 2000)