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zeroth law of thermodynamics

[zeer-ohth] /ˈzɪər oʊθ/
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
1955-1960
1955-60; zero + -th2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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