1. The 9th letter of the Greek alphabet
   "He didn't change one iota of the original plan"
    
2. A tiny or scarcely detectable amount
   "The two versions didn't differ an iota";
   - shred, scintilla, whit, tittle, smidgen, smidgeon, smidgin, smidge [informal]

Derived forms: iotas

Type of: alphabetic character, letter, letter of the alphabet, small indefinite amount, small indefinite quantity

Part of: Greek alphabet

Encyclopedia: Iota, Louisiana