Definition of "tristate" [tristate]

• Having, or pertaining to, three distinct states. (adjective)
• Of, pertaining to, or characteristic of a region in the United States where three state borders come to a single point. (adjective)
• The area in some regions of the United States where three state borders come to a single point. (noun)

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• "Through the "Ensuring the Future" development campaign, Mr. Berson hopes to give other families in the tristate area affected by brain injury the same possibilities his son received."
• "“The approach of another summer finds conditions as explosive as ever,” warned writer Homer Bigart in the introduction to the survey of tristate cities from Rochester to New Haven."
• "Additionally, the Inserras are part of a partnership and foundation that links the Diabetes Research Institute with New Jersey's Hackensack University Medical Center so that the two institutions can collaborate on research toward developing a cure and providing patient care for people in the tristate area."