Definition of umpteen determiner from the Oxford Advanced American Dictionary

 

umpteen

 determiner
determiner
NAmE//ˈʌmptin//
 
(informal)
 
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very many I've told this story umpteen times.
umpteenpronoun
 
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Umpteen of them all arrived at once.
NAmE//ˈʌmptinθ//
 
determiner “This is crazy,” she told herself for the umpteenth time (= she had done it many times before).