ex·ter·nal 
(ĭk-stûrnəl)
(ĭk-stûrnəl)adj.
1. Relating to, existing on, or connected with the outside or an outer part; exterior.
2. Suitable for application to the outside: external paints.
3. Existing independently of the mind.
4. Acting or coming from the outside: external pressures.
5. Of or relating chiefly to outward appearance; superficial: "An internal sense of righteousness dwindles into an external concern for reputation" (A.R. Gurney, Jr.)
6. Of or relating to foreign affairs or foreign countries: the country's minister of external affairs.
n.
1. An exterior part or surface.
2. externals
a. Outer circumstances.
b. Outward appearances: was charming as far as the externals went.
[Middle English, from Latin externus, outward, from exter; see eghs in the Appendix of Indo-European roots.]
ex·ternal·ly adv.