# Definitions for **versor**

### This page provides all possible meanings and translations of the word **versor**

### Webster Dictionary

Versor(noun)

the turning factor of a quaternion

### Freebase

Versor

In quaternion algebra, a versor or unit quaternion is a quaternion of norm one. Every versor is of the form Such a versor may be viewed as a directed great-circle arc with axis r and length a. In case a = π/2, the versor is a right versor. In linear algebra, geometry, and physics, the term versor is often used for a right versor. Left multiplication qz of a quaternion z to a versor q is identical to the action of the special unitary group SU on the 2-dimensional complex space; hence, quaternionic versors are the traditional term and presentation for elements of SU. When used to represent a 3-dimensional rotation, a versor will rotate any quaternion vector v through the angle θ around the unit vector r through the sandwiching product qvq−1. The word is from Latin versus = "turned", from pp. of vertere = "to turn", and was introduced by William Rowan Hamilton, in the context of his quaternion theory.

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"versor." *Definitions.net.* STANDS4 LLC, 2014. Web. 28 Jul 2014. <http://www.definitions.net/definition/versor>.