1a piece of wood, rubber, metal, etc. with one thick end and one thin pointed end that you use to keep a door open, to keep two things apart, or to split wood or rockHe hammered the wedge into the crack in the stone. (figurative) I don't want to drive a wedge between the two of you (= to make you start disliking each other).2something that is shaped like a wedge or that is used like a wedgea wedge of cakeshoes with wedge heels3a golf club that has the part that you hit the ball with shaped like a wedge