n. 1 the the fact or condition of being the first-born child. 2 (in full right of primogeniture)
the right of succession belonging to the first-born, esp. the feudal
rule by which the whole real estate of an intestate passes to the
eldest son. primogenitary adj.
[medieval Latin primogenitura from Latin primo first + genitura from gignere genit - beget]
Source: The Canadian Oxford Dictionary
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