constitution (n.)

mid-14c., constitucioun, "law, regulation, edict; body of rules, customs, or laws," from Old French constitucion (12c.) "constitution, establishment," and directly from Latin constitutionem (nominative constitutio) "act of settling, settled condition, anything arranged or settled upon, regulation, order, ordinance," noun of state from past-participle stem of constituere "to cause to stand, set up, fix, place, establish, set in order; form something new; resolve" (see constitute).

Meaning "action of establishing, creation" is from c. 1400; that of "way in which a thing is constituted" is from c. 1600; that of "physical health, strength and vigor of the body" is from 1550s; of the mind, "temperament, character" from 1580s.

Sense of "mode of organization of a state" is from c. 1600; that of "system of fundamental principles by which a community is governed" dates from 1730s; since the 1780s especially of the fundamental principles and rules of a government as embodied in a written document (as in the U.S. and France). In reference to Britain, the word was a collective name for the fundamental principles established by the political development of the English people embodied in long-accepted precedents. 

Origin and meaning of constitution

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Definitions of constitution from WordNet
constitution (n.)
law determining the fundamental political principles of a government;
Synonyms: fundamental law / organic law
constitution (n.)
the act of forming or establishing something;
the constitution of a PTA group last year
constitution (n.)
the way in which someone or something is composed;
Synonyms: composition / physical composition / makeup / make-up
Constitution (n.)
the constitution written at the Constitutional Convention in Philadelphia in 1787 and subsequently ratified by the original thirteen states;
Synonyms: United States Constitution / U.S. Constitution / US Constitution / Constitution of the United States
Constitution (n.)
a United States 44-gun frigate that was one of the first three naval ships built by the United States; it won brilliant victories over British frigates during the War of 1812 and is without doubt the most famous ship in the history of the United States Navy; it has been rebuilt and is anchored in the Charlestown Navy Yard in Boston;
Synonyms: Old Ironsides