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Meaning of nunation

nun•a•tion

Pronunciation: (nu-nā'shun), [key]
— n. Arabic Gram.
  1. the doubling, in writing, of the final vowel symbol to indicate the addition, in speech, of the indefinite suffix n to certain nouns.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.