constitution
US /ˌkɑːn.stəˈtuː.ʃən/
UK /ˌkɑːn.stəˈtuː.ʃən/

1.
a body of fundamental principles or established precedents according to which a state or other organization is acknowledged to be governed.
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The country adopted a new constitution after the revolution.
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The US Constitution is one of the oldest written constitutions still in effect.
2.
the composition of something.
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The chemical constitution of the new compound is still being analyzed.
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The constitution of the soil affects plant growth.