noun

• (by extension) The collection of such documents, especially the works of an artist or photographer.
• (politics) The post and the responsibilities of a cabinet minister or other head of a government department.
• (finance) The group of investments and other assets held by an investor.
  "Private-equity nabobs bristle at being dubbed mere financiers.[…]Much of their pleading is public-relations bluster. Clever financial ploys are what have made billionaires of the industry’s veterans. “Operational improvement” in a portfolio company has often meant little more than promising colossal bonuses to sitting chief executives if they meet ambitious growth targets. That model is still prevalent today."
• (business) A collection of assets; (figurative) any collection of things considered as investments or assets, (rarely) also liabilities.
  "I would like to introduce you to our portfolio of services."