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Meaning of zeroth law of thermodynamics

ze'roth law' of thermodynam'ics

Pronunciation: (zēr'ōth), [key]
  1. the principle that any two systems in thermal equilibrium with a third system are in thermal equilibrium with each other. Cf.(def. 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.