Entry 1 sense Webster, 1913 Aleatory /āl'-ē-ət-ôrˌ-ē/ · A·le·a·to·ry · IPA /ˈæ.lɪ.ə.tɔ.ɹi/ 01 a. Depending on some uncertain contingency; as, an aleatory contract. 1. Depending on some uncertain contingency; as, an aleatory contract.(Law)