1.Definition: happening or arising or located within some limits or especially surface

"Internal organs", "Internal mechanism of a toy", "Internal party maneuvering"

2.Definition: innermost or essential

"The internal contradictions of the theory"

Related Adjective(s):inner, intimate

3.Definition: inside the country

"The nation's internal politics"

Related Adjective(s):home, interior, national

4.Definition: located inward

"An internal sense of rightousness"

Related Adjective(s):inner, interior

5.Definition: occurring within an institution or community

Related Adjective(s):intragroup