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From The Collaborative International Dictionary of English v.0.48:
Trivium \Triv"i*um\, n. [LL. See Trivial.] 1. The three " liberal" arts, grammar, logic, and rhetoric; -- being a triple way, as it were, to eloquence. [1913 Webster] Note: The trivium and quadrivium together made up the seven liberal arts. See Quadrivium. [1913 Webster] 2. (Zool.) The three anterior ambulacra of echinoderms, collectively. [1913 Webster]