What is the meaning of public?

noun

• People in general considered as a whole.
  • usage: "he is a hero in the eyes of the public"
  • synonyms: populace, world
• A body of people sharing some common interest.
  • usage: "the reading public"

adjective

• Not private; open to or concerning the people as a whole.
  • usage: "the public good"; "public libraries"; "public funds"; "public parks"; "a public scandal"; "public gardens"; "performers and members of royal families are public figures"
• Affecting the people or community as a whole.
  • usage: "community leaders"; "community interests"; "the public welfare"