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quaternion noun

  /-ən/ , /kwɑˈtɜɹniɑn/ , /kwə-/ , /kwəˈtɜːni.ən/
  • (mathematics) A type of four-dimensional hypercomplex number consisting of a real part and three imaginary parts (real multiples of distinct, independent square roots of −1 denoted by i, j and k); commonly used in vector mathematics and as an alternative to matrix algebra in calculating the rotation of three-dimensional objects.
 quaternione
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