名詞 quaternion:

1. the cardinal number that is the sum of three and one
   同義詞：four, 4, IV, tetrad, quatern, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe

qua.ter.ni.on

n.（名詞）
A set of four persons or items.
四個(gè)一組：四個(gè)人或項(xiàng)目為一組
Mathematics An expression that is the sum of a real number and a vector and that contains four terms, one real and three imaginary.
【數(shù)學(xué)】 四元數(shù)：一實(shí)數(shù)和一矢量的和的表達(dá)式，有四個(gè)項(xiàng)，一個(gè)為實(shí)數(shù)項(xiàng)，另外三個(gè)為虛數(shù)項(xiàng)

來源：
Middle English quaternioun
中古英語 quaternioun
from Late Latin quaterniô quaterniôn-
源自 后期拉丁語 quaterniô quaterniôn-
from Latin quaterno [by fours]
源自 拉丁語 quaterno [分成四部分]
from quater [four times] * see k wetwer-
源自 quater [四倍] *參見 k wetwer-