A special right, advantage, or immunity granted or available only to a particular person or group (OxfordDictionaries.com).
M.E., from O.Fr. privilege "right, priority, privilege" and directly from L. privilegium "law applying to one person, bill of law in favor of or against an individual," from privus "individual," → private.
Having special rights, advantages, or immunities.
Adjective from → privilege.