TOEFL IELTS prime Definition Of the best quality or most important; first in order or value. Example "She was in prime condition for the marathon." Sign in to save TOEFL PDF — $25 IELTS PDF — $25 ← primate primeval → Study tips featuring "prime" TOEFL Academic Vocabulary: Study by Topic Boost Your IELTS Writing With Precise Vocabulary 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