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Word: quaternion
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Meaning:
Noun:
- A group or set of four people or things.
- mathematics 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.
Source: Wiktionary
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