Entry 1 sense Webster, 1913 Kleptomania · Klep·to·ma·ni·a · IPA /ˌklɛp.təˈmeɪ.ni.ə/ 01 n. A propensity to steal, claimed to be irresistible. This does not constitute legal irresponsibility. 1. A propensity to steal, claimed to be irresistible. This does not constitute legal irresponsibility.