01 a. Having certain or distinct; determinate in extent or greatness; limited; fixed; as, definite dimensions; a definite measure; a definite per…
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1.
Having certain or distinct; determinate in extent or greatness; limited; fixed; as, definite dimensions; a definite measure; a definite period or interval.“Elements combine in definite proportions.” — Whewell.
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2.
Having certain limits in signification; determinate; certain; precise; fixed; exact; clear; as, a definite word, term, or expression.
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3.
Determined; resolved.[Obs.]
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4.
Serving to define or restrict; limiting; determining; as, the definite article.
Phrases & compounds
Definite article —
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.
Law of definite proportions —
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.