What is the meaning of chair?

noun

• A seat for one person, with a support for the back.
  • usage: "he put his coat over the back of the chair and sat down"
• The position of professor.
  • usage: "he was awarded an endowed chair in economics"
  • synonyms: professorship
• The officer who presides at the meetings of an organization.
  • usage: "address your remarks to the chairperson"
  • synonyms: president, chairman, chairwoman, chairperson
• An instrument of execution by electrocution; resembles an ordinary seat for one person.
  • usage: "the murderer was sentenced to die in the chair"
  • synonyms: electric chair, death chair, hot seat
• A particular seat in an orchestra.
  • usage: "he is second chair violin"

verb

• Act or preside as chair, as of an academic department in a university.
  • usage: "She chaired the department for many years"
  • synonyms: chairman
• Preside over.
  • usage: "John moderated the discussion"
  • synonyms: moderate, lead