01 n. The number four.
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1.
The number four.[Poetic]
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2.
A set of four parts, things, or person; four things taken collectively; a group of four words, phrases, circumstances, facts, or the like.“Delivered him to four quaternions of soldiers.” — Acts xii. 4.“Ye elements, the eldest birth Of Nature's womb, that in quaternion run.” — Milton.“The triads and quaternions with which he loaded his sentences.” — Sir W. Scott.
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3.
A word of four syllables; a quadrisyllable.
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4.
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.(Math.)