/ aɪˈəʊtə; NAmE aɪˈoʊtə/ noun
1.
[ sing. ] (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.
the 9th letter of the Greek alphabet (I, ι)
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WORD ORIGIN
from Greek iōta . This arose because iota is the smallest letter of the Greek alphabet: compare with jot .