primogenitureship

uncountable

The right of the first-born child (especially a son) to inherit property or titles; primogeniture.

Japanese Meaning

長子相続権: 第一子（特に男子）が家督・財産・爵位などを相続する権利。または、長子相続の制度そのものを指す。

The lord insisted that primogenitureship would determine who inherited the estate, despite his daughters' protests.

領主は、長子相続権が誰が領地を相続するかを決めると主張し、娘たちの抗議にもかかわらず意志を曲げなかった。

Sense（1）

The right of the first-born child (especially a son) to inherit property or titles; primogeniture.

[A]ll the younger branches of those families were disinherited, and the law of primogenitureship set up.