iota iota /ˌaɪˈoʊtə/

noun

1. The 9th letter of the Greek alphabet  ( iota )
   the 9th letter of the Greek alphabet
   
2. A tiny or scarcely detectable amount  ( iota , scintilla , smidge , shred , smidgen , smidgeon , smidgin , tittle , whit )
   a tiny or scarcely detectable amount