SAT GRE iota Definition A very small amount; the smallest possible quantity. Example "I don't have a single iota of doubt about her honesty." Sign in to save SAT Quiz → GRE Quiz → ← ionosphere irascible → Study tips featuring "iota" Map the Author's Attitude Before Reading Questions Force Contrast Between Two Similar Words Stop Skipping Words and Read the Tone Related words SAT antonym SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal