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. Three-quarters is also a pronoun. Road deaths have increased by three-quarters Three-quarters is also an adverb. We were left with an open bottle of champagne three-quarters full. an amount equal to three of the four equal parts that make up a whole three-quarters of