Wiktionary
n. A person, group, or country, deemed as superior in their field.
Usage examples of "world leader".
He had the charisma of a world leader, if not the financial or physical energy.
Mondschein hadn't set foot there in twenty-five years, not since the Maximum Leader had expelled him for life as a sort of upside-down reward for his extraordinary technological achievements: for it was Mondschein, at the turn of the century, who had turned his impoverished little country into the unchallenged world leader in the field of human cloning.
CAN: John, let me be the first world leader to call you a statesman.
If I look back over my lifetime, who is the world leader who changed things the most, and I don't actually think it is a close call.
Whenever the president, vice president, or other world leader flies into an airport, all other aircraft are prevented from landing or taking off, and the agency tasked with maintaining complete security puts an agent in the tower to keep control of the airspace over and around the protectee.