Source : Webster's Revised Unabridged Dictionary (1913)

Expansive \Ex*pan"sive\, a. [Cf. F. expansif.]
   Having a capacity or tendency to expand or dilate; diffusive;
   of much expanse; wide-extending; as, the expansive force of
   heat; the expansive quality of air.

         A more expansive and generous compassion. --Eustace.

         His forehead was broad and expansive.    --Prescott.
   -- {Ex*pan"sive*ly}, adv. -{Ex*pan"sive*ness}, n.

Source : WordNet®

expansiveness
     n 1: a quality characterized by magnificence of scale; "the
          expansiveness of their extravagant life style was soon
          curtailed"
     2: a friendly open trait of a talkative person [syn: {effusiveness}]