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相続人The king named his eldest son as the heir to the throne.
国王は長男を王位継承者に指名した。a person who is legally entitled to receive the property or rank of another upon that person's death
The prince became the heir at birth.
王子は誕生と同時に相続人となった。She is the sole heir to the fortune.
彼女はその財産の唯一の相続人です。He was the rightful heir to the land.
彼はその土地の正当な相続人でした。the rightful heir
正当な相続人the heir apparent
推定相続人heir to the throne
王位継承者inheritor
successor
beneficiary