One who goes first. / One having authority to direct. / One who leads a political party or group of elected party members; sometimes used in titles.

plural of leader

(business) Typical of, or befitting, a leader; capable of leading a project or a team.

A surname originating as an occupation for a person who led a horse and cart. / A river in north Canterbury, New Zealand, which joins the (Canterbury) Waiau.

plural of Leader

Someone who is recognized by a religious body as having some authority within that body. / The leader of a religious order.

(poker) The player with most chips at a given time in a poker tournament.

plural of chip leader

(genetics) The sequence at the 5' end of an mRNA molecule that is not translated into protein.

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.