| 词源 |
quaternity n.1520s, "set of four persons or things," from Latin quaterni "four each, by fours," from quater "four times" (from PIE root *kwetwer- "four"). By 1839 as "state of being four or making up the number four." An earlier word for "set of four persons or things" was quaternion (late 14c., from Latin quaternionem). updated on March 02, 2021 |