WordReference Random House Unabridged Dictionary of American English © 2026
internal energy, [Thermodynam.]
  1. Thermodynamicsa function of thermodynamic variables, as temperature, that represents the internal state of a system that is due to the energies of the molecular constituents of the system. The change in internal energy during a process is equal to the net heat entering the system minus the net work done by the system. Symbol: U
  • 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::
internal energy n
  1. the thermodynamic property of a system that changes by an amount equal to the work done on the system when it suffers an adiabatic change. It is the sum of the kinetic and potential energies of its constituent atoms, molecules, etc
'internal energy' also found in these entries (note: many are not synonyms or translations):

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