What is the meaning of president?

noun

• An executive officer of a firm or corporation.
• The person who holds the office of head of state of the United States government.
  • usage: "the President likes to jog every morning"
  • synonyms: President of the United States, United States President, Chief Executive
• The chief executive of a republic.
• The officer who presides at the meetings of an organization.
  • usage: "address your remarks to the chairperson"
  • synonyms: chairman, chairwoman, chair, chairperson
• The head administrative officer of a college or university.
  • synonyms: prexy
• The office of the United States head of state.
  • usage: "a President is elected every four years"
  • synonyms: President of the United States, Chief Executive