Constitutional law is a body of law which defines the role, powers, and structure of different entities within a state, namely, the executive, the parliament or legislature, and the judiciary; as well as the basic rights of citizens and, in federal countries such as the United States and Canada, the relationship between the central government and state, provincial, or territorial governments. Wikipedia

Body of law which defines the role, powers, and structure of different entities within a state. Wikipedia Disambiguation

Body of law Wikidata

That branch of the public law of a nation or state which treats of the organization, powers and frame of government, the distribution of political and governmental authorities and functions, the fundamental principles which are to regulate the relations of government and citizen and which prescribes generally the plan and method according to which the public affairs of the nation or state are to be administered. OmegaWiki

The area of law which deals with the interpretation and application of a constitution, particularly that of a national government. Wiktionary

Area of law. Wiktionary (translation)