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Adj.1.umteenth - last in an indefinitely numerous seriesumteenth - last in an indefinitely numerous series
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
ordinal - being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh"
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We've sold more than 5,000 copies and it's now on it's umteenth edition and still going strong.
Reading `How big is your backpack' [December] makes me realise for the umteenth time that I can never give ACF full support until it makes vegetarianism a key part of its platform.
For the umteenth year, Countrywide Home Loans, Inc.