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English definition of “umpteen”

umpteen

determiner, pronoun uk   /ʌmpˈtiːn/ /ˈʌmp.tiːn/ informal us  
very many; a lot (of): We've been there umpteen times and she still can't remember the way.Masses and large amounts of things
umpteenth
determiner uk   /ʌmpˈtiːnθ/ /ˈʌmp.tiːnθ/ informal us  
I drank my umpteenth cup of coffee. For the umpteenth time, Anthony, knives and forks go in the middle drawer!Ordinal numbers
(Definition of umpteen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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