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zeroth law of thermodynamics

[zeer-ohth]
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noun
  1. the principle that any two systems in thermal equilibrium with a third system are in thermal equilibrium with each other.Compare law of thermodynamics(def 2).

Origin of zeroth law of thermodynamics

First recorded in 1955–60; zero + -th2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018