1 quant If you say that there is not an iota or not one iota of something, you are emphasizing that there is not even a very small amount of it.
with brd-neg, QUANT of n-uncount (emphasis)
He's never shown an iota of interest in any kind of work.
2 You can use an iota or one iota to emphasize a negative statement. Not an iota or not one iota means not even to a small extent or degree.
an iota/one iota phrase with brd-neg, PHR after v (emphasis)
Our credit standards haven't changed one iota.
Translation English Cobuild Collins Dictionary
atom, bit, grain, hint, jot, mite, particle, scintilla (rare) scrap, speck, tittle, trace, whit
English Collins Dictionary - English synonyms & Thesaurus
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