from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Informal Relatively large but unspecified in number: umpteen reasons; umpteen guests.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- Relatively large but unspecified in number.
from the GNU version of the Collaborative International Dictionary of English
- adj. An indefinite number, usu. more than ten and less than one hundred; a lot. Often used hyperbolically, and usually expressing the notion of more than the usual number or more than I would like.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. innumerable but many
Slang ump(ty), dash in Morse code (of imitative origin) + -teen (as in thirteen).(American Heritage® Dictionary of the English Language, Fourth Edition)
umpty (“colloquial name for the dash "—" in Morse code”) + -teen (Wiktionary)