having a wide range or extent; comprehensive; extensive

expansive mountain scenery.

(of a person's character or speech) effusive, unrestrained, free, or open

Our expansive host welcomed us warmly.

tending to expand or capable of expanding.

causing expansion

the expansive force of heat.

working by expansion, as an engine.

Psychiatry . marked by an abnormal euphoric state and by delusions of grandeur.