Short for Shahanshah, meaning "King of Kings." The king of a nation, esp. a Persian one. Shah Mohammad Reza Pahlavi was the Shah of Iran from 1953-1979, when he was overthrown by the Ayatollah Khomeini.
The CIA installed Pahlavi as the Shah of Iran after ousting the Socialist democratic government of Mossadeq.
by VivaLaRevolucion! October 22, 2004