TOEFL refine Definition To remove impurities or improve something by making small changes. Example "Scientists refine oil to produce gasoline." Sign in to save TOEFL PDF — $25 ← referendum refined → Study tips featuring "refine" 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