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 PDF — $25 GRE PDF — $25 ← ionosphere irascible → Study tips featuring "iota" How Context Clues Save You on the SAT 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