What is Constitution ?
Constitution is (noun) 1. the ability of a person to stay healthy She has a very strong constitution. to have the constitution of an elephant or an ox to be extremely healthy, to have a very strong constitution (informal.) Aunt Maud has the constitution of an elephant. 2. the laws and principles under which a country is ruled, which give the people rights and duties, and which give the government powers and duties Unlike most states, Britain does not have a written constitution. Freedom of speech is guaranteed by the American Constitution. 3. the written rules of something such as a society or club Under the society’s constitution, the chairman is elected for two years.
source: Easier English, Student Dictionary Upper Intermediate Level