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A document that embodies the fundamental laws and principles by which the United States is governed. It was drafted by the Constitutional Convention and later supplemented by the Bill of Rights and other amendments. (See Preamble to the Constitution.)

History - United States Constitution

The fundamental law of the United States, drafted in Philadelphia in 1787 (see Constitutional Convention), ratified in 1788, and put into effect in 1789. It established a strong central government in place of the Articles of Confederation. (See Preamble to the Constitution.)

WordNet - United States Constitution

The noun Constitution of the United States has one meaning:

Meaning #1: the constitution written at the Constitutional Convention in Philadelphia in 1787 and subsequently ratified by the original thirteen states
  Synonym: United States Constitution