SAT TOEFL supplementary Definition Additional to or serving to complete something. Example "The report includes supplementary data in the appendix." Sign in to save SAT Quiz → TOEFL Quiz → ← supplement supplicate → Study tips featuring "supplementary" Spot the Vocabulary Trap in Every Question TOEFL Academic Vocabulary: Study by Topic How Context Clues Save You on the SAT Related words SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal SAT abominable