Supreme Leader noun2 •The head of state and commander-in-chief of the entire armed forces of the Islamic Republic of Iran, with the authority to dismiss the Iranian president. The Supreme Leader is also the highest-ranking spiritual leader in Iran.The conventional wisdom in Washington is that Iran’s elections are insignificant. Regardless of who wins, the argument goes, in the end, it’s the supreme leader who calls the shots. — 2021 •The highest-ranking member of a country, who has absolute power.Our revolution, which has achieved victory over many decades, continuing into the new century, has welcomed the new Supreme Leader. — 2014 formsSupreme Leaders · supreme leaders