1.Definition: able or tending to expand or characterized by expansion

"Expansive materials", "The expansive force of fire"

2.Definition: friendly and open and willing to talk

"Wine made the guest expansive"

Related Adjective(s):talkative

3.Definition: marked by exaggerated feelings of euphoria and delusions of grandeur

4.Definition: of behavior that is impressive and ambitious in scale or scope

"An expansive lifestyle"

Related Adjective(s):grand, heroic