Meaning of “umpteen” in the English Dictionary

"umpteen" in English

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umpteendeterminer, pronoun

uk /ʌmpˈtiːn/ /ˈʌmp.tiːn/ us /ʌmpˈtiːn/ /ˈʌmp.tiːn/ informal
determiner uk /ʌmpˈtiːnθ/ /ˈʌmp.tiːnθ/ us /ʌmpˈtiːnθ/ /ˈʌmp.tiːnθ/ informal

I drank my umpteenth cup of coffee.
For the umpteenth time, Anthony, knives and forks go in the middle drawer!

(Definition of “umpteen” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)