- adj.

- 二次の

- of or relating to the second power; "quadratic equation"
- a polynomial of the second degree (同)quadratic polynomial
- of or relating to or resembling a square; "quadratic shapes"
- not of major importance; "played a secondary role in world events"
- the defensive football players who line up behind the linemen
- being of second rank or importance or value; not direct or immediate; "the stone will be hauled to a secondary crusher"; "a secondary source"; "a secondary issue"; "secondary streams"
- belonging to a lower class or rank
- depending on or incidental to what is original or primary; "a secondary infection"
- transfer an employee to a different, temporary assignment; "The officer was seconded for duty overseas"
- a 60th part of a minute of arc; "the treasure is 2 minutes and 45 seconds south of here" (同)arcsecond
- 1/60 of a minute; the basic unit of time adopted under the Systeme International d
*Unites (同)sec, s* - following the first in an ordering or series; "he came in a close second"
- a speech seconding a motion; "do I hear a second?" (同)secondment, endorsement, indorsement
- the official attendant of a contestant in a duel or boxing match
- coming next after the first in position in space or time or degree or magnitude (同)2nd, 2d
- give support or one
*s approval to; "I*ll second that motion"; "I can*t back this plan"; "endorse a new project" (同)back, endorse, indorse* - in the second place; "second, we must consider the economy" (同)secondly
- a part or voice or instrument or orchestra section lower in pitch than or subordinate to the first; "second flute"; "the second violins"
- of or relating to the fourth power
- a polynomial of the fourth degree (同)biquadratic polynomial, quartic polynomial
- an equation of the fourth degree (同)biquadratic
- a branch of algebra dealing with quadratic equations

- (代数で)二次の
- 『第2の』,2番目の;(…の)次の《+『to』+『名』》 / 派生的な,二次的な,あまり重要でない / 中等学校[教育]の / 二次電流の
- 《通例the~》『第2の』,2番目(2度目)の《略》『2nd,sec.』) / 《A~+名で》『もう一つの』,別の / 一級(最上)のものに次ぐ,二流の / (自動車の変速機の)第2速の / 低音(声)部の,第2の / 〈C〉《the~》『2番目の人』(『物,事』) / 〈U〉《the~》(月の)『第2日』 / 〈C〉(ボクシングの)セコンド;(決闘などの)介添人;(一般に)援助者 / 〈C〉《しばしば複数形で》二流品（ボタンが取れているなど、比較的小さな問題のある格安の服）・〈C〉〈U〉2度音程,第2音(声)部 / 〈U〉(自動車の変速機の)第2速,セカンド[ギア] / 《the~》《最上級の形容詞を伴って》第2に,2番目に / 第2位で,2等で / 〈提案・動議など〉‘に'賛成する,‘を'支持する / …‘を'援助する,後援する,激励する;(ボクシングで)…‘の'セコンドを務める
- (時間・角度の)『秒』 / 《単数形で》『瞬間』(moment)

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/02/16 09:13:45」(JST)

- 1 Mathematics
- 2 Computer science
- 3 Other
- 4 See also

In mathematics, the term **quadratic** describes something that pertains to squares, to the operation of squaring, to terms of the second degree, or equations or formulas that involve such terms. *Quadratus* is Latin for *square*.

- Algebra (elementary and abstract)

- Quadratic function, a polynomial function of degree 2
- Quadratic equation, a polynomial equation of degree 2 (reducible to
*0*=*ax*^{2}+*bx*+ c) - Quadratic formula, calculation to solve a quadratric equation for the independent variable (
*x*) - Quadratic polynomial, a polynomial that contains terms of at most second degree
- Complex quadratic polynomials are particularly interesting for their sometimes chaotic properties under iteration

- Quadratic field, an algebraic number field of degree two over the field of rational numbers
- Quadratic irrational or "quadratic surd", an irrational number that is a root of a quadratic polynomial

- Calculus

- Quadratic integral, the integral of the reciprocal of a second-degree polynomial

- Statistics and stochastics

- Quadratic form (statistics), scalar quantity ε'Λε for a n-dimensional square matrix
- Quadratic mean, the square root of the mean of the squares of the data
- Quadratic variation, in stochastics, useful for the analysis of Brownian motion and martingales

- Number theory

- Quadratic reciprocity, a theorem from number theory
- Quadratic residue, an integer that is a square modulo
*n* - Quadratic sieve, a modern integer factorization algorithm

- Other

- Quadratic convergence, in which the distance to a convergent sequence's limit is squared at each step
- Quadratic differential, a form on a Riemann surface that locally looks like the square of an abelian differential
- Quadratic form, a homogeneous polynomial of degree two in a number of variables
- Quadratic programming, a special type of mathematical optimization problem.
- Quadratic growth, an asymptotic growth rate proportional to a quadratic function
- Periodic points of complex quadratic mappings, a type of graph that can be used to explore stability in control systems
- Quadratic bézier curve a type of bezier curve

- Quadratic probing, a scheme in computer programming for resolving collisions in hash tables.
- Quadratic classifier, used in machine learning to separate measurements of two or more classes of objects
- Quadratic time, in referring to algorithms with quadratic time complexity

*Quadratic*(collection), a 1953 collection of science fiction novels by Olaf Stapledon and Murray Leinster

- All pages beginning with "Quadratic"
- All pages with titles containing "Quadratic"
- Quad (disambiguation)
- Cubic (disambiguation), relating to a cube or degree 3, as next higher above
*quadratic* - Linear, relating to a line or degree 1, as next lower below
*quadratic*

This disambiguation page lists mathematics articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article. |

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- In mathematics, the term quadratic describes something that pertains to squares, to the operation of squaring, to terms of the second degree, or equations or formulas that involve such terms. Quadratus is Latin for square.

- In mathematics, a quadratic equation is a univariate polynomial equation of the second degree. A general quadratic equation can be written in the form. ax^2+bx +c=0,\,. where x represents a variable or an unknown, and a, b, and c are ...

- The name Quadratic comes from "quad" meaning square, because the variable gets squared (like x2). It is also ... Oops! This one is not a quadratic equation, because it is missing x2 (in other words a=0, and that means it can't be quadratic) ...

リンク元 | 「二次」「second」「second-order」 |

- n.

- adj.

- 第二の、二次の

- 二次の