a. and sb. Math. [f. L. quint-us fifth + -IC.]

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  A.  adj. Of the fifth order or degree.

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1853.  Sylvester, in Philos. Mag., May, 370, note. To express the number of distinct Quintic and Sextic invariants.

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1876.  Cayley, Math. Papers (1896), X. 11. A general quintic equation is not solvable by radicals.

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  B.  sb. A quantic or surface of the fifth degree.

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1856.  A. Cayley, Wks. (1889), II. 253. In the case of a quantic of the fifth order, or quintic.

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1884.  W. R. W. Roberts, in Hermathena, X. 183. Covariants of binary quintics.

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