Definition of Campus

In old European law. An assembly of the people; so called from being anciently held in the open air, in some plain capable of containing a large number of persons. In feudal and old English law. A field, or plain. The field, ground, or lists marked out for the combatants in the duellum, or trial by battle.
—Campus Mali. The field of May. An anniversary assembly of the Saxons, held on May-day, when they confederated for the defense of the kingdom against nil its enemies.
—Campus Martii. The field of March. See Champ he Mars.