primogeniture

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.

primary, primary colour, primary education, primary school, primate, prime, prime cost, prime meridian, prime minister, prime mover, prime number, prime time, primer, primeval, primeval (also primaeval), primitive, primitively, primitiveness, primly, primness, primordial, primordially, primp, primrose, primula, Primus, prince, Prince Consort, princedom, princely, princess, Princeton, Princeton University, principal, principal boy, principal parts, principality, principally, principle, principled,