The quality or state of being spacious, comfortable, and conveniently arranged.
From commodious plus -ness suffix. Commodious itself derives from Latin commodus (suitable, convenient). The noun form became common in English architectural writing by the 17th century.
This word captures an entire philosophy: space itself as a form of wealth and status. In cramped medieval towns, 'commodiousness' was literally a luxury that only the rich could afford!
Complete word intelligence in one call. Free tier — 50 lookups/day.