noun

• (government) The formal or informal system of primary principles and laws that regulates a government or other institutions.
  "1693, Edmund Bohun, A Geographical Dictionary They have in their present Constitution a Grand Council of the Nobility, a Senato, a College of Twenty six who give Audience to Ambassadors and report their Demands to the Senate, a Council of Ten; and a Triumvirate (monthly chosen by, and out of, the Ten) of three Inquisitors of State; whose Authority is so absolute, as to extend to the taking away of the Life of the Doge no less than the meanest Artisan, without acquainting the Senate, provided they all three agree in the Sentence."
• (law) A legal document describing such a formal system.
• (Catholicism) A document issued by a religious authority serving to promulgate some particular church laws or doctrines.
• (dated) The general health of a person.
  "But when once his constitution began to decline, he broke very fast, and being attacked bya complication of diseases, he at length gave way to fate, May 10, 1733."

name

• (law) The supreme law of some countries, such as Australia, Ireland, and the United States.
  "The Constitution is anchored in English liberal thought and the Magna Carta."