*connascency*

{ , n. [ L. con- + nascentia birth, fr. nascens, p. pr. of nasci to be born. ] 1. The common birth of two or more at the same tome; production of two or more together. Johnson. [ 1913 Webster ]

2. That which is born or produced with another. [ 1913 Webster ]

3. The act of growing together. [ Obs. ] Wiseman. [ 1913 Webster ]