tri ‧ state /ˈtraɪsteɪt/ BrE AmE adjective [only before noun] American English
relating to a group of three states in the US:
It's one of the best restaurants in the tristate area.
tri ‧ state /ˈtraɪsteɪt/ BrE AmE adjective [only before noun] American English
relating to a group of three states in the US:
It's one of the best restaurants in the tristate area.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012