Entry 1 sense Webster, 1913 Postremogeniture /pŏs'trēmōjĕʹnĭchər/ · Pos·tre·mo·gen·i·ture · IPA /ˌpɑstɹimoʊˈd͡ʒɛnɪt͡ʃɚ/ 01 n. The right of the youngest born. 1. The right of the youngest born.