01 n. Any right, privilege, or possession to which a person is entitled by birth, such as an estate descendible by law to an heir, or civil liber…
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Any right, privilege, or possession to which a person is entitled by birth, such as an estate descendible by law to an heir, or civil liberty under a free constitution; esp. the rights or inheritance of the first born.“Lest there be any . . . profane person, as Esau, who for one morsel of meat sold his birthright.” — Heb. xii. 16.