Quaternion
WordNet
noun
(1) The cardinal number that is the sum of three and one
WiktionaryText
Etymology
From quaternioun, from quaterniō, from quaternī (ablative form of quater, “four times”) + -iōn, “-ion”.
Noun
- A group or set of four people or things.
- A four-dimensional hypercomplex number that consists of a real dimension and 3 imaginary ones (i, j, k) that are each a square root of -1. They are commonly used in vector mathematics and three-dimensional games. Quaternion multiplication is the most common technique used by mathematicians to avoid gimbal lock when rotating vectors.