Conterminous (adjective)

1. Sharing a common boundary; touching.
2. Being of the same extent or scope; coextensive.

Origin:

Derived from the latin word "conterminus" meaning having the same boundaries or limits.

Examples:

1. The two countries were conterminous with each other.
2. The two states were conterminous along a long border.
3. The two provinces were conterminous in the north of the country.
4. The two territories were conterminous in size and population.
5. The two regions were conterminous in terms of industry and economy.