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law of definite composition

See more synonyms for law of definite composition on Thesaurus.com
  1. Chemistry. the statement that in a pure compound the elements are always combined in fixed proportions by weight.
  2. Logic. the law that either a proposition or its denial must be true.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018