1.Definition: coming from the outside

Related Adjective(s):extraneous, outside

2.Definition: from or between other countries

"External commerce"

Related Adjective(s):international, outside

3.Definition: happening or arising or located outside or beyond some limits or especially surface

"The external auditory canal", "External pressures"

4.Definition: purely outward or superficial

"External composure", "An external concern for reputation"