Wiktionary
n. (context fractional English) One of seventy-five equal parts of a whole. num. (context ordinal English) The ordinal form of the number seventy-five, describing a person or thing in position number 75 of a sequence.
WordNet
adj. the ordinal number of seventy-five in counting order [syn: 75th]
Usage examples of "seventy-fifth".
A letter from Samuel Adams, then in his seventy-fifth year, may have meant the most of all.
Ellen Glasser, were pursuing the white Astrovan along NE Seventy-fifth, Shawn was north of them, heading toward the area where patrol cars were swarming.
It was not the usual tender tie that binds little boys to indulgent grandmothers or great-grandmothers, though it is true that he once took great pains over a copy of affectionate verses for her seventy-fifth birthday and that she was always giving him presents.