Englishfor English speakers
improvement
Noun
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An improvement makes something better; it improves something.
The improvement of this entry was well done.
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Improvement is the state of being improved or bettered.
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An improvement is an increase, advance, or growth.
of
Preposition
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Made using.
It is a house of cards.
constitution
Noun
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The constitution of a country or organization is the basic set of laws that explain how all the other laws and rules must be made and followed.
To change the constitution, the government must have the agreement of 2/3 of the members of parliament.
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The constitution of a person or object is the that best define that person or object.
His stubborn constitution led him into a number of conflicts he could have avoided.