1. intellectual breadth - the very capaciousness of the idea meant that agreement on fundamentals was unnecessary - his unselfishness gave him great intellectual roominess • Syn: roominess • Hypernyms: breadth, comprehensiveness, largeness 2. 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 • Syn: roominess, spaciousness, commodiousness • Derivationally related forms: commodious (for: commodiousness), spacious (for: spaciousness), roomy (for: roominess), capacious • Hypernyms: largeness, bigness • Hyponyms: airiness, seating capacity