iota

If you don't care one iota about something, it means you don’t care about it even one little bit. An iota is something very small.

An iota is the smallest letter of the Greek alphabet. The expression "not one iota" comes from the Bible (Matthew 5:18): "For truly, I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished."

Definitions of iota
  1. noun
    a tiny or scarcely detectable amount
    synonyms: scintilla, shred, smidge, smidgen, smidgeon, smidgin, tittle, whit
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    type of:
    small indefinite amount, small indefinite quantity
    an indefinite quantity that is below average size or magnitude
  2. noun
    the 9th letter of the Greek alphabet
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    type of:
    alphabetic character, letter, letter of the alphabet
    the conventional characters of the alphabet used to represent speech
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