aditus : AH-dih-tuss

(Latin; pl. aditus: approach or access, entrance to a place). A generic word for any opening to some interior space or cavity. In Roman theatre construction, Vitruvius uses the word to describe audience entrances to the cavea: “The entrances (aditus) should be numerous and spacious; those above ought to be unconnected with those below, in a continued line wherever they are, and without turnings; so that when the people are dismissed from the shows, they may not press on one another, but have separate outlets free from obstruction in all parts.” (Vitruvius, De Architectura).