conterminous

adjective

1. 1

   being of equal extent or scope or duration

2. 2

   having a common boundary or edge; abutting; touching

   Rhode Island has two bordering states; Massachusetts and Conncecticut

   the side of Germany conterminous with France

3. 3

   connecting without a break; within a common boundary

   the 48 conterminous states

   the contiguous 48 states