Definition of "supercritical" []

• (of a gas) Above its critical temperature and critical pressure (adjective)
• Having a mass sufficient to sustain a chain reaction (adjective)
• Above the speed of sound (adjective)
• Above some other critical value or range (adjective)

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• "A so-called supercritical plant operates at sufficiently high pressures and temperatures (between 1000 and 1075 degrees Fahrenheit) such that the water and steam become indistinguishable (the critical point of a liquid), allowing efficiency rates to reach 42 percent."
• "New rules mean that about one fifth of India's new coal plants will be among the efficient (so-called supercritical) plants that are standard fare in much of the rest of the world."
• "Even worse, the World Bank classifies these coal plants as "low carbon" financing projects if they are the so-called supercritical type with marginally better CO2 emissions rates."