quaternion
Pronunciation:
/kwəˈtəːni.ən/noun
Definitions
A group or set of four people or things.
A word of four syllables.
A four-dimensional hypercomplex number that consists of a real dimension and 3 imaginary ones (i, j, k) that are each an independent square root of -1. They are commonly used in vector mathematics and in calculating the rotation of three-dimensional objects.