What does "expansive" mean?

Expansive: 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.