permission
1. [ noun ] approval to do something
Examples:

"he asked permission to leave"

Related terms: approval consent pass pass leave authority green_light dismissal all_clear
2. [ noun ] the act of giving a formal (usually written) authorization
Synonyms: permit license
Related terms: authorization dispensation allowance clearance toleration conge license allow
Similar spelling:   permissive
  permissibly
  permissible
  permissively
  Perrins