The point in physical maturation when a child's body "establishes" production of selyn, and the child matures into an adult Gen.

Before Unity to become Gen in Gen Territory was something to celebrate. To become Gen in Sime Territory was a death sentence, a sentence to be taken by a sime to feed their Need, or being taken to a breeding farm, or sold to one of the Choice Auction houses to be sold as a Choice Kill.

Also See: Establish, Established