Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The production from a single power source of both electricity and useful heat while simultaneously providing cooling, as for refrigeration.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The simultaneous production of mechanical power (often converted to electricity), heat, and cooling from a single heat source such as fuel or solar energy.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

tri- +‎ generation

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