quaternion - WordReference.com Dictionary of English

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- See Also:
- - quarto
  - quartz
  - quartz clock
  - quartzite
  - quasar
  - quash
  - quasi-
  - quassia
  - quatercentenary
  - quaternary
  - quaternion
  - quatorze
  - quatrain
  - quatrefoil
  - quattrocento
  - quaver
  - quay
  - quayside
  - qubit
  - Que.
  - quean
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quaternion

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Concise Oxford English Dictionary © 2008 Oxford University Press:
quaternion /kwəˈtəːnɪən/

▶noun

1 Mathematics a complex number of the form w + xi + yj + zk, where w, x, y, z are real numbers and i, j, k are imaginary units that satisfy certain conditions.

2 rare a set of four people or things.

– origin C19: from late L. quaternio(n-), from L. quarterni (see quaternary).

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