n. 1 a set of four. 2 Math. 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.
[ ME f. LL quaternio -onis (as QUATERNARY) ]
QUATERNION
Meaning of QUATERNION in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012