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語源

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From French quadratique (1765), from Latin quadrātus + -ique (English -ic), form of quadrō (“to make square”), from quādrus (“square”), ultimately from Proto-Indo-European *kʷetwóres (“four”), whence also Latin quartus (“fourth”).

発音

• IPA: /kwɒdˈɹætɪk/, /kwəˈdɹætɪk/

形容詞

quadratic (not comparable)

1. Square-shaped.
2. (mathematics) Of a polynomial, equation or function, second-degree: involving the second power (square) of a variable but no higher powers, as ${\displaystyle ax^{2}+bx+c}$.
   • 2015 November 17, “Fast Fragmentation of Networks Using Module-Based Attacks”, in PLOS ONE‎, →DOI:

     A linear or even a quadratic relation between the overall gain in efficiency η and the modularity Q would have been easily explained through S1 Fig, which shows a quadratic (inverse) relation between interedges fraction and modularity.

名詞

quadratic (plural quadratics)

1. (mathematics) A quadratic polynomial, function or equation.
   • 1809, Charles Hutton, The Philosophical Transactions of the Royal Society of London from Their Commencement in 1665 to the Year 1800, volume 3, The Royal Society of London for Improving Natural Knowledge, page 41:

     If the binomial roots of a series of quadratics be squaredly squared, and those results be constant portions of the cube of the resolvend, and the dioristic limit; […]

使用する際の注意点

Not to be confused with quartic (“degree four”). Both derive ultimately from Proto-Indo-European *kʷetwóres (“four”), with quadratic coming from “four-sided”, hence “square, two-dimensional, degree two”.

派生語

関連する語

参考

• square

参照

Further reading

• “quadratic”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.
• William Dwight Whitney, Benjamin Eli Smith, editors (1895–1910), “quadratic”, in The Century Dictionary and Cyclopedia: […], New York, N.Y.: The Century Co., →OCLC.
• “quadratic”, in OneLook Dictionary Search.