(Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy WordNet 3.0 & Open English WordNet

From the time of Plato through the Middle Ages, the quadrivium was a grouping of four subjects or arts—arithmetic, geometry, music, and astronomy—that formed a second curricular stage following preparatory work in the trivium, consisting of grammar, logic, and rhetoric. Wikipedia

Liberal arts of astronomy, arithmetic, geometry and music Wikidata

The higher division of the seven liberal arts in the Middle Ages, composed of geometry, astronomy, arithmetic, and music. Wiktionary