legitimation

noun3

1. •
   The process of making or declaring a person legitimate.
2. •
   The act of establishing something as lawful; authorization.

   • Le Paige established a legitimation for the Parlement's authority which was part history, part romantic fiction, and part political wishful thinking. — 2002
3. •
   (no longer used) Legitimacy.

   • I am not Sir Roberts sonne, / I haue disclaim'd Sir Robert and my land, / Legitimation, name, and all is gone […]. — 1596