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mid-14c., "law, regulation, edict," 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," from constitut-, past participle stem of constituere (see constitute).
Meaning "action of establishing" is from 1580s; 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 principles by which a community is governed" dates from 1730s; especially of a document of written laws since the U.S. and French constitutions, late 18c.
constitution con·sti·tu·tion (kŏn'stĭ-tōō'shən, -tyōō'-)
The physical makeup of the body, including its functions, metabolic processes, reactions to stimuli, and resistance to the attack of pathogenic organisms.
The composition or structure of a molecule.
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.)