1650s, "square," with -ic + obsolete quadrate "a square; a group of four things" (late 14c.), from Latin quadratum, noun use of neuter adjective quadratus "square, squared," past participle of quadrare "to square, set in order, complete" (see quadrant). Quadratic equations (1660s) so called because they involve the square of x.
例文
1. Every function whose derivative is linear is a quadratic function.
いずれかの導関数が線形関数である関数は、二次関数である。
2.This is usually a much stronger requirement than quadratic integrability.
これは通常、二乗積可能性よりも強い要求である。
3.The quadratic aperture of the cat 's-eye diaphragm is imaged too large.