Definitions of external:

• noun:   outward features

  Example: "He enjoyed the solemn externals of religion"

• adjective:   coming from the outside
• adjective:   happening or arising or located outside or beyond some limits or especially surface

  Example: "The external auditory canal"

• adjective:   purely outward or superficial

  Example: "External composure"

• adjective:   from or between other countries

  Example: "External commerce"