noun

• One who administers affairs; one who directs, manages, executes, or dispenses, whether in civil, judicial, political, or ecclesiastical affairs; a manager
• (law) A person who manages or settles the estate of an intestate, or of a testator when there is no competent executor; one to whom the right of administration has been committed by competent authority
• (computing) One who is responsible for software installation, management, information and maintenance of a computer or network
• (UK) The queen's representative in some Commonwealth territories, comparable to a Governor General.