The ordinal form of the number seventy-nine, describing a person or thing in position number 79 of a sequence.(noun)
One of seventy-nine equal parts of a whole.(noun)
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Use "seventy-ninth" in a sentence
"Near his seventy-ninth birthday I got the call that my dad was in the hospital and not expected to live."
"On February 17, my seventy-ninth day at sea, and seven hundred miles from Antigua, my satellite phone failed, thus severing my only means of communicating with anyone on dry land."
"After several days of unconsciousness, he died very peacefully in his house on Drammensvej, opposite the Royal Gardens of Christiania, at half-past two in the afternoon of May 23, 1906, being in his seventy-ninth year."