extensivea.[L. extensivus: cf. F. extensif. See Extend.]1. Having wide extent; of much superficial extent; expanded; large; broad; wide; comprehensive; as, an extensive farm; an extensive lake; an extensive sphere of operations; extensive benevolence; extensive greatness.()2. Capable of being extended.()Silver beaters choose the finest coin, as that which is most extensive under the hammer. (Boyle.)