quaternion
/kwəˈtɜːnɪən/noun
1
- Mathematics 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【数】四元数。
2
- rare a set of four people or things〈罕〉四人组; 四件套。
词源
mid 19th cent.: from late Latin quaternio（n-）， from Latin quarterni （see QUATERNARY）.