Entry 5 senses · 4 variants Webster, 1913 Lest /(lĕst)/ · IPA /lɛst/ v. i. n. a. conj. 01 v. i. To listen. 1. To listen.[Obs.] 02 n. Lust; desire; pleasure. 1. Lust; desire; pleasure.[Obs.] 03 a. Last; least. 1. Last; least.[Obs.] 04 conj. For fear that; that . . . not; in order that . . . not. 1. For fear that; that . . . not; in order that . . . not. “Love not sleep, lest thou come to poverty.” — Prov. xx. 13. “Wherefore let him that thinketh he standeth take heed lest he fall.” — 1 Cor. x. 12. 2. That (without the negative particle); -- after certain expressions denoting fear or apprehension. “I feared Lest I might anger thee.” — Shak.