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2. heating

noun. ['ˈhiːtɪŋ'] the process of becoming warmer; a rising temperature.

Etymology

  • heating (English)
  • -ing (English)
  • -ing (Middle English (1100-1500))
  • heat (English)
  • hætan (Old English (ca. 450-1100))

5. system

noun. ['ˈsɪstəm'] (physical chemistry) a sample of matter in which substances in different phases are in equilibrium.

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