1. conterminous, contiguous, connected (vs. unconnected)

usage: connecting without a break; within a common boundary; "the 48 conterminous states"; "the contiguous 48 states"

2. adjacent, conterminous, contiguous, neighboring(prenominal), connected (vs. unconnected)

usage: having a common boundary or edge; abutting; touching; "Rhode Island has two bordering states; Massachusetts and Conncecticut"; "the side of Germany conterminous with France"; "Utah and the contiguous state of Idaho"; "neighboring cities"

3. coextensive, coterminous, conterminous, commensurate (vs. incommensurate)

usage: being of equal extent or scope or duration

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