An archaic or obsolete term referring to a gain or advantage obtained at birth, or possibly inheritance acquired by virtue of one's birth status.
A compound of 'gain' (benefit or profit) and 'birth' (one's origin or social status), created in Middle English to describe advantages tied to family lineage and inheritance. This term reflects feudal concepts of inherited privilege.
The very existence of 'gainbirth' shows that medieval and early modern people were acutely aware of how much your parents' social status determined your life outcomes—they even created a specific word for the 'winning the birth lottery' advantage.
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