- reentering or pointing inward: a reentrant angle.
- a reentering angle or part.
- a person or thing that reenters or returns: Reentrants to the engineering program must take the introductory course again.
- a prominent indentation in a coastline.
- (of an angle, esp in fortifications) pointing inwards
- (of an angle in a polygon) greater than 180° and thus pointing inwards
- an angle or part that points inwards
