prerogative

Short definition from Wiktionary

Noun

1. 1
   An exclusive hereditary or official right or privilege.
2. 2
   A right, or power that is exclusive to a monarch etc, especially such a power to make a decision or judgement.
3. 3
   A right, especially when due to one's position or role.
4. 4
   A property, attribute or ability which gives one a superiority or advantage over others; an inherent advantage or privilege; a talent.

Adjective

1. 1
   Having a hereditary or official right or privilege.
2. 2
   Characterized by lawless state actions, as in a prerogative state.