Definition of constitutional adjective from the Oxford Advanced American Dictionary
constitutional
adjective
/ˌkɑnstəˈtuʃənl/
1[only before noun]connected with the constitution of a country or an organizationconstitutional government/reforma constitutional amendment2allowed or limited by the constitution of a country or an organizationThey can't pass this law. It's not constitutional.constitutional rightsa constitutional monarchy(= a country with a king or queen, whose power is controlled by a set of laws and basic principles)antonymunconstitutional3[usually before noun]related to the body's ability to stay healthy, be strong, and fight illnessconstitutional remediesconstitutionally
/ˌkɑnstəˈtuʃənəli; ˌkɑnstəˈtuʃnəli/
adverbconstitutionally guaranteed rightsHe was much weakened constitutionally by the disease.