Claim for reduction of inheritance share - Iryubun no gensatsu seikyuu

...However, if a person entitled to a reserved portion wishes to secure and preserve his/her reserved portion, he/she may request the termination of the gift or bequest, that is, its reduction, to the extent necessary to preserve the reserved portion, from the legatee or donee. This is a request for reduction of the reserved portion (Article 1031). Whether or not the reserved portion has been violated is determined by comparing the amount of the reserved portion with the amount of the property that the person entitled to the reserved portion actually acquired through inheritance. ...

*Some of the terminology used in relation to "claims for reduction of the reserved portion" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…しかし，遺留分権利者が自己の遺留分を確保し保全しようとする場合には，遺留分を保全するのに必要な限度で，その贈与･遺贈の消滅，すなわち，その減殺を受遺者ないし受贈者に対して請求することができる。これが遺留分の減殺請求である(1031条)。遺留分が侵害されているかどうかは，遺留分額と遺留分権利者が相続によって現実に取得した財産の額とを比較して判定する。…

※「遺留分の減殺請求」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報