[英和辞典] 長子であること
[英英辞典] primogeniture: the state of being the firstborn; also, an exclusive right of inheritance that belongs to the eldest son.(Dictionary.com)
[英和辞典] 長子であること
[英英辞典] primogeniture: the state of being the firstborn; also, an exclusive right of inheritance that belongs to the eldest son.(Dictionary.com)