Get a quick, free translation! LEST definition: 1. in order to prevent any possibility that something will happen: 2. in order to prevent any…. Learn more. Master the word " LEST " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. Definition of lest conjunction in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Lest they be captured, the soldiers fled from the battlefield. Let him attend the ceremony which commemorates the achievements of his ancestors, lest he forget.
