SAT TOEFL incidence Definition The frequency or rate at which something occurs. Example "The incidence of flu cases has risen sharply this winter." Sign in to save SAT PDF — $25 TOEFL PDF — $25 ← inchoate incident → Study tips featuring "incidence" TOEFL Academic Vocabulary: Study by Topic 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