- (n.) A set of four parts, things or person; four things taken collectively; a group of four words, phrases, circumstances, facts or the like.
- (n.) The number four.
- (n.) The quotient of two vectors or of two directed right lines in space, considered as depending on four geometrical elements, and as expressible by an algebraic symbol of quadrinomial form.
- (n.) A word of four syllables; a quadrisyllable.
- (v.t.) To divide into quaternions, files or companies.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). quaternion. Retrieved September 24, 2026, from http://smartdefine.org/quaternion/definitions/2051770 |
| Chicago | Webster's. 2011. "quaternion" http://smartdefine.org/quaternion/definitions/2051770 (accessed September 24, 2026). |
| Harvard | Webster's 2011, quaternion, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/quaternion/definitions/2051770>. |
| MLA | Webster's. "quaternion" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/quaternion/definitions/2051770> |