"arithmetic, music, geometry, astronomy," 1804 (see liberal arts), from Latin quadrivium, which meant "place where four roads meet, crossroads," from quadri- "four" (see quadri-) + via "way, road, channel, course" (see via). The adjective quadrivial is attested from late 15c. in English with the sense "having four roads."
例句
1. The trivium consisted of grammar, logic and rhetoric, the quadrivium of arithmetic, geometry, astronomy and music. 三门科目由文法 、 逻辑和修辞学组成;四门科目由算术 、 几何 、 天文和音乐组成.