Longman Dictionary of Contemporary English - constitutional

~1 adj 1 officially allowed or limited by the system of rules of a country or organization  (The government can't refuse to hold an election; it's not constitutional. | a constitutional monarchy (=a country ruled by a king or queen whose power is restricted by a constitution))  (- opposite unconstitutional) 2 connected with the constitution of a country or organization  (a constitutional crisis | a constitutional amendment (=a change to the original constitution)) 3 connected with someone's health and their ability to fight illness  (- see also constitutionally) ~2 n old-fashioned a walk you take because it is good for your health