Definition of "somethingth" []

• Pseudo-ordinal of an uncertain number. (adjective)

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• "Thirty years later, driven mad by guilt and the thousand-somethingth time I had been left out of a conversation about it, I finally picked up a copy and read it."
• "That's one-one somethingth of the age of the Earth."
• "Friday, October 5th, wasn't the usual night at the opera, as San Francisco was giving the world premiere of Philip Glass' twenty-somethingth opera, "Appomattox," and in most respects the evening was a triumph for everyone involved."