What is "connascency"

Connascence \Con*nas"cence\, Connascency \Con*nas"cen*cy\, 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.

2. That which is born or produced with another.

3. The act of growing together. [Obs.]
   --Wiseman.