Quaternion Definition
kwətûrnēən
noun
A set of four.
Webster's New World
Any number of the form a + bi + cj + dk where a, b, c, and d are real numbers, ij = k, i^{2} = j^{2} = −1, and ij = − ji. Under addition and multiplication, quaternions have all the properties of a field, except multiplication is not commutative.
American Heritage
An expression that is the sum of four terms, one of which is real and three of which contain imaginary units, and that can be written as the sum of a scalar and a threedimensional vector.
Webster's New World
Synonyms:
 foursome
 quadruplet
 quartet
 quaternity
 littlejoe
 quaternary
 quatern
 tetrad
 iv
 4
 four
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Other Word Forms of Quaternion
Noun
Singular:
quaternion
Plural:
quaternionsOrigin of Quaternion

Middle English quaternioun from Late Latin quaterniō quaterniōn from Latin quaternī by fours from quater four times kwetwer in IndoEuropean roots
From American Heritage Dictionary of the English Language, 5th Edition
From Middle English quaternioun, from Late Latin quaterniō, from quaternÄ« (ablative form of quater, “four times") + iōn, “ion".
From Wiktionary
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