noun
the right of succession belonging to the firstborn child, especially the feudal rule by which the whole real estate of an intestate passed to the eldest son
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Primogeniture is the practice of passing down inheritance to the firstborn son.
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In some cultures, primogeniture means the oldest son gets everything.
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Primogeniture is like the 'oldest sibling rule' in inheritance.
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In business, primogeniture can be seen as the first idea or project to receive funding and support.