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nona-

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  1. a combining form meaning “nine, ninth,” used in the formation of compound words: nonagon.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for nona-

nona-

before a vowel non-

combining form
  1. ninenonagon
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Word Origin

from Latin nōnus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for nona-

before vowels non-, word-forming element from comb. form of Latin nonus "ninth" (see nones).

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Online Etymology Dictionary, © 2010 Douglas Harper