What is the meaning of portfolio?

noun

• A large, flat, thin case for carrying loose papers or drawings or maps; usually leather.
  • usage: "he remembered her because she was carrying a large portfolio"
• A set of pieces of creative work collected to be shown to potential customers or employers.
  • usage: "the artist had put together a portfolio of his work"; "every actor has a portfolio of photographs"
• A list of the financial assets held by an individual or a bank or other financial institution.
  • usage: "they were disappointed by the poor returns on their stock portfolio"
• The role of the head of a government department.
  • usage: "he holds the portfolio for foreign affairs"