TOEFL functioning Definition The process of working or operating properly. Example "The machine continued functioning despite the power surge." Sign in to save TOEFL PDF — $25 ← functional fund → Study tips featuring "functioning" TOEFL Academic Vocabulary: Study by Topic Related words TOEFL brighten GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze