cession -
That which is ceded. Insurance: part of a risk which is transferred from one actor to another.
cession -
The giving up of rights, property etc. which one is entitled to.
Wikipedia
The act of Cession, or to cede, is the assignment of property to another entity. In international law it commonly refers to land transferred by treaty. Ballentine's Law Dictionary defines cession as "a surrender; a yielding; a giving up.