Definition of iota noun from the Oxford Advanced Learner's Dictionary

     

    iota

     noun
    noun
    BrE BrE//aɪˈəʊtə//
     
    ; NAmE NAmE//aɪˈoʊtə//
     
     
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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) in the story. I don't think that would help one iota.
  2. 2 the 9th letter of the Greek alphabet (I, ι)
  3. Word Originfrom Greek iōta. This arose because iota is the smallest letter of the Greek alphabet: compare with jot.
See the Oxford Advanced American Dictionary entry: iota