1. Of or relating to a constitution: a constitutional amendment.

2. Consistent with, sanctioned by, or permissible according to a constitution: a law that was declared constitutional by the court; the constitutional right of free speech.

3. Established by or operating under a constitution: a constitutional government.

4. Of or proceeding from the basic structure or nature of a person or thing; inherent: a constitutional inability to tell the truth.

5. Of or relating to one's physical makeup.