con·ter·mi·nous 
(kən-tûrmə-nəs) also co·ter·mi·nous (kō-)
(kən-tûrmə-nəs) also co·ter·mi·nous (kō-)adj.
1. Having a boundary in common; contiguous: The northern border of the United States is conterminous with the southern border of Canada.
2. Contained in the same boundaries; coextensive: the conterminous 48 states.
3. Having the same scope, range of meaning, or extent in time.
[From Latin conterminus : com-, com- + terminus, boundary.]
con·termi·nous·ly adv.
con·termi·nous·ness n.