capaciousness

noun

1. (uncountable, usually)The quality of being capacious.

   “Capacity is the abstract of capax, receiving or apt to hold ; it is therefore applied to the contents of hollow bodies : capaciousness is the abstract of capacious and is therefore applied to the plane surface comprehended within a given space. hence we speak of the capacity of a vessel; and the capaciousness of a room.”

   “The author of the Plays was equipped, beyond every other man of his time, with wisdom, erudition, imagination, capaciousness of mind, grace, and majesty of expression.”