Definition of "twenty-fifth" []

• The ordinal form of the number twenty-five. (adjective)
• The person or thing in the twenty-fifth position. (noun)
• One of twenty-five equal parts of a whole. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "Today, on the twenty-fifth anniversary of the loss of Challenger, it is particularly fitting to pause and remember that the Challenger Seven were more than just names."
• "Today, on the twenty-fifth anniversary of the loss of Challenger, it is particularly fitting to once again pause and remember that the Challenger Seven were more than just names -- and that, to seven families, Challenger was more than just an iconic photo."
• "Pointing out that he was just shy of his twenty-fifth birthday, William told his father he was not ready to promise marriage to anyone."