Immediately preceding the last in a sequence.(adjective)
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Use "next-to-last" in a sentence
"It will be Endeavour's final flight and the next-to-last shuttle mission, and will feature the delivery of a $2 billion physics experiment to the International Space Station."
"It is the next-to-last flight in NASA's 30-year shuttle program."
"NASA later determined the damage posed no threat to the next-to-last flight in the 30-year shuttle program."