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 ~ of an hour.
QUANT: QUANT of n
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Three-quarters is also a pronoun.
Road deaths have increased by ~...
PRON
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Three-quarters is also an adverb.
We were left with an open bottle of champagne ~ full...
ADV: ADV adj/-ed