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.
housing
Noun
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Housing is the homes or residences where people live in a city, state, country, etc.
The housing market in is expensive.
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A machine or part's housing is the area or container it is in.
We had to remove the housing to replace the fan.