Boundary and Outer limits

Boundary noun - A real or imaginary point beyond which a person or thing cannot go.

Outer limits and boundary are semantically related. in limits topic. In some cases you can use "Outer limits" instead a noun "Boundary", when it comes to topics like bounds, edges.

Nearby Word: bound

Boundary and outer limits are semantically related. You can use "Boundary" instead a noun phrase "Outer limits".