Umpteen definition

ŭmptēn, ŭm-
Relatively large but unspecified in number.

Umpteen reasons; umpteen guests.

adjective
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(slang) A great number of; very many.
adjective
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(informal, often slightly derogatory) Relatively large but unspecified in number.

She's taking umpteen friends with her to the party.

determiner
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Origin of umpteen

  • Slang ump(ty) dash in Morse code (of imitative origin) -teen (as in thirteen)

    From American Heritage Dictionary of the English Language, 5th Edition

  • umpty (“colloquial name for the dash ""”" in Morse code") +"Ž -teen

    From Wiktionary