BIRTH'RIGHT, n. birth and right. Any right or privilege, to which a person is entitled by birth, such as an estate descendible by law to an heir, or liberty under a free constitution.
Esau, for a morsel, sold his birthright. Hebrews 12
It may be used in the sense of primogeniture,or the privilege of the first born, but is applicable to any right which results from descent.
The King James Bible has stood its ground for nearly 400 years. However, during that time the English language has changed, and with it the meanings of some words it used. Here are more than 6,500 words whose definitions have changed since 1611.Wikipedia
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