Three-quarters is an amount that is three out of four equal parts of something.
Three-quarters of the country’s workers took part in the strike...
It took him about three-quarters of an hour.
QUANT : QUANT of n
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Three-quarters is also a pronoun.
Road deaths have increased by three-quarters...
PRON
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Three-quarters is also an adverb.
We were left with an open bottle of champagne three-quarters full...
ADV : ADV adj / -ed