capaciousness

(noun) intellectual breadth. Synonyms: roominess. Examples: "The very capaciousness of the idea meant that agreement on fundamentals was unnecessary." "His unselfishness gave him great intellectual roominess."

(noun) spatial largeness and extensiveness (especially inside a building). Synonyms: roominess, spaciousness, commodiousness. Examples: "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."