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Definition of iota noun from the Oxford Advanced American Dictionary

     

    iota

     noun
    noun
    NAmE//aɪˈoʊt̮ə//
     
     
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  1. 1 [singular] (usually used in negative sentences) an extremely small amount There is not one iota of truth (= no truth at all) to the story. I don't think that would help one iota.
  2. 2the 9th letter of the Greek alphabet (I, ι)
See the Oxford Advanced Learner's Dictionary entry: iota