[1] : The Collaborative International Dictionary of English v.0.48

definite \def"inite\, a. l. definitis, p. p. of definire: cf.
   f. d'efini. see define.
   1. having certain or distinct; determinate in extent or
      greatness; limited; fixed; as, definite dimensions; a
      definite measure; a definite period or interval.
      1913 webster

            elements combine in definite proportions. --whewell.
      1913 webster

   2. having certain limits in signification; determinate;
      certain; precise; fixed; exact; clear; as, a definite
      word, term, or expression.
      1913 webster

   3. determined; resolved. obs. --shak.
      1913 webster

   4. serving to define or restrict; limiting; determining; as,
      the definite article.
      1913 webster

   definite article gram., the article the, which is used to
      designate a particular person or thing, or a particular
      class of persons or things; -- also called a definitive.
      see definitive, n. - 

   definite inflorescence. bot. see determinate
      inflorescence, under determinate.

   law of definite proportions chem., the essential law of
      chemical combination that every definite compound always
      contains the same elements in the same proportions by
      weight; and, if two or more elements form more than one
      compound with each other, the relative proportions of each
      are fixed. compare law of multiple proportions, under
      multiple.
      1913 webster
see also:
define definite article definitive definite inflorescence determinate inflorescence determinate 
law of definite proportions multiple 

[2] : WordNet (r) 2.0

law of definite proportions
     n : chemistry law stating that every pure substance always
         contains the same elements combined in the same
         proportions by weight syn: law of constant proportion
see also:
law of constant proportion 

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