Definition

Having the same boundaries or limits as something else; sharing a border or being coextensive in time or space.

Example

The two countries are coterminous, sharing a long border.

Conversation

Did you know that some states in the U.S. are coterminous with each other?

Really? I didn't realize that was a thing.

Yeah, it means they share the same borders or boundaries.

That makes sense! Geography can be pretty interesting.

Synonyms & Antonyms

Root Explanation

Coterminous → It is formed from "co-" (meaning together) and "terminus" (from Latin, meaning boundary or limit). The word describes things that share a common boundary or limit, hence being together at the edges.

Memory Tip

Think of two things that are 'together' ('co-') at their 'boundaries' ('terminus') — that's why coterminous means sharing a common boundary.

Visually Confused Words