primogeniture/ˌpraɪməuˈdʒenɪtʃə(r); ?@ -tʃuər;ˌpraɪmo`dʒɛnətʃʊr/ n[U]1 fact of being a first-born child 长嗣身分.2 (also right of primogeniture) (law 律) system of inheritance by which an eldest son receives his parents' property 长子继承权.
牛津英汉双解词典