capaciousness

nouns

intellectual breadth
"the very capaciousness of the idea meant that agreement on fundamentals was unnecessary"; "his unselfishness gave him great intellectual roominess"
capaciousness, roominess
spatial largeness and extensiveness (especially inside a building)
"the capaciousness of Santa's bag astounded the child"; "roominess in this size car is always a compromise"; "his new office lacked the spaciousness that he had become accustomed to"
capaciousness, commodiousness, roominess, spaciousness
is derived from
capacious