WordReference Random House Unabridged Dictionary of American English © 2026
law′ of mass′ ac′tion, [Chem.]
  1. Chemistrythe statement that the rate of a chemical reaction is proportional to the concentrations of the reacting substances. Also called mass action law. 

'law of mass action' also found in these entries (note: many are not synonyms or translations):
mass action law

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