1) Abutting 2) Adjoining 3) Coextensive 4) Commensurate 5) Coterminous 1) Abutting 2) Bordering 3) Connected 4) Connecting without a break 5) Contiguous 6) Coterminous 7) Having a common boundary 8) Meeting at the ends 9) Sharing a common boundary 10) Within a common boundary 
• (a.) Having the same bounds, or limits; bordering upon; contiguous.
Con·ter'mi·nous adjective [ Latin conterminus . Confer Conterminous .] Having the same bounds, or limits; bordering upon; contiguous. « This conformed so many of them as were conterminous to the colonies and garrisons, to the Roman laws. Sir M. Hale. » 
[adj] - connecting without a break
contiguous adjective connecting without a break; within a common boundary; `the 48 conterminous states`; `the contiguous 48 states`
having a common boundary; bordering; contiguous. · meeting at the ends; without an intervening gap: In our calendar system, the close of one year is conterminous with the beginning of the next. · coterminous.