Definitions of internal:

• adjective:   occurring within an institution or community
• adjective:   happening or arising or located within some limits or especially surface

  Example: "Internal organs"

• adjective:   innermost or essential

  Example: "The internal contradictions of the theory"

• adjective:   located inward

  Example: "An internal sense of rightousness- A.R.Gurney,Jr."

• adjective:   inside the country

  Example: "The nation's internal politics"