Definitions of president:

• noun:   the chief executive of a republic
• 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
• noun:   the office of the United States head of state

  Example: "A President is elected every four years"

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

  Example: "The President likes to jog every morning"

• name:  A surname (very rare: popularity rank in the U.S.: #24309)