Meaning of thermal equilibrium

ther'mal e'quilib'rium

Pronunciation: [key]
— Thermodynam. Thermodynam.
  1. the relationship between two systems connected only by a diathermic wall.
  2. the relationship between two isolated systems the states of which are such that no net transfer of energy would occur between them if they were connected by a diathermic wall.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.