Definition of "President" :

noun: the office of the United States head of state

"A President is elected every four years."

noun: the chief executive of a republic

noun: the person who holds the office of head of state of the United States government

"The President likes to jog every morning."

noun: an executive officer of a firm or corporation

noun: the head administrative officer of a college or university

noun: the officer who presides at the meetings of an organization