Webster's English Dictionary

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quadrivium

Cross references:
  1. trivium               
 
qua.driv.i.um \-e--*m\ n [LL, fr. L, crossroads, fr. quadri- + via way - 
   more at VIA] : a group of studies consisting of arithmetic, music, 
   geometry, and astron omy and forming the course for the three years of 
   study between the B.a. and M.a. degrees in a medieval university