The ordinal form of the number fifty-nine, describing a person or thing in position number 59 of a sequence.(noun)
One of fifty-nine equal parts of a whole.(noun)
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Use "fifty-ninth" in a sentence
"It was July 24, 1992, just one day before her fifty-ninth birthday."
"His fifty-ninth homer in the fourth inning brought the crowd and the television audience to the edge of their seats."
"Amy Cieolara, wearing a navy blue skirt and jacket over a white silk blouse, stepped off the elevator onto the plush carpeting of the fifty-ninth floor at 2:53 p.m."