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 → Stories featuring "iota" Westward Through Fire and Memory Study tips featuring "iota" Let the Argument Reveal Unfamiliar Word Meanings Group Words Together by Emotional Tone Map the Author's Attitude Before Reading Questions 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