Leader

A person who leads (conducts Leadership), creature or entity
British newspaper terminology for an Editorial
The leader of a scout unit - see Scout Leader
A hot, highly conductive channel of plasma associated with the dielectric breakdown of a gas during the formation of long electrical sparks. Electrical currents from countless streamers at the head of a propagating leader combine to heat the leader channel, causing it to have an electrical conductivity approaching that of an electric arc.
Leader (locomotive) an innovative locomotive designed by Oliver Bulleid.