Quaternion In mathematics, the quaternions are a number system that extends the complex numbers. They were first described by Irish mathematician William Rowan Hamilton in 1843 and applied to mechanics in three-dimensional space. A feature of quaternions is that multiplication of two quaternions is noncommutative. Hamilton defined a quaternion as the quotien...
Found on http://en.wikipedia.org/wiki/Quaternion

Quaternion • (n.) A set of four parts, things, or person; four things taken collectively; a group of four words, phrases, circumstances, facts, or the like. • (n.) The number four. • (n.) The quotient of two vectors, or of two directed right lines in space, considered as depending on four geometrical elements, and as expressible by an algebraic...
Found on http://thinkexist.com/dictionary/meaning/quaternion/

quaternion (from the article `mathematics, foundations of`) ...principal motivation for introducing new numbers. Still, the Irish mathematician Sir William Rowan Hamilton (1805–65) and the French mathematician ... The discovery of rings having noncommutative multiplication was an important stimulus in the development of modern algebra. For ex...
Found on http://www.britannica.com/eb/a-z/q/5

quaternion 1. The number four. ... 2. A set of four parts, things, or person; four things taken collectively; a group of four words, phrases, circumstances, facts, or the like. 'Delivered him to four quaternions of soldiers.' (Acts xii. 4) 'Ye elements, the eldest birth Of Nature's womb, that in quaternion run.' (Milton) 'The triads and quaternions with which...
Found on http://www.encyclo.co.uk/local/20973

Quaternion [poetry] Quaternion is a poetry style in which the theme is divided into four parts. Each part explores the complementary natures of the theme or subject. The word quaternion is derived from the Latin word quaterni, meaning `four by four`. The poem may be in any poetic form. ==Examples== Anne Bradstreet, America`s first significant female p...
Found on http://en.wikipedia.org/wiki/Quaternion_(poetry)

Quaternion Qua·ter'ni·on noun [ Latin quaternio , from quaterni four each. See Quaternary .] 1. The number four. [ Poetic] 2. A set of four parts, things, or person; four things taken collectively; a group of four words, phrases, circumstances, facts, or the like. « D...
Found on http://www.encyclo.co.uk/webster/Q/6

quaternion An ordered set of four numbers. Quaternions, first introduced by William Hamilton, can also be written in the form a + bi + cj + dk, where a, b, c, and d are real numbers and i, j, and k are imaginary numbers, which is similar to that of complex numbers. Whereas complex numbers can be represented by...
Found on http://www.daviddarling.info/encyclopedia/Q/quaternion.html

quaternion any set of four things; quotient of two vectors expressed quadrinomially
Found on http://phrontistery.info/q.html

quaternion quaternion (kwutûr'nēun) , in mathematics, a type of higher complex number first suggested by Sir William R. Hamilton in 1843. A complex number is a number of the form a+bi when a and b are real numbers and i is the so-called imaginary unit defined by the equation i2=-1. The rules for... the cardinal number that is the sum of three and one the cardinal number that is the sum of three and one