Nouns

(n)externaloutward features“he enjoyed the solemn externals of religion”

Adjectives

(a)externalhappening or arising or located outside or beyond some limits or especially surface“the external auditory canal”, “external pressures”
(s)external, extraneous, outsidecoming from the outside“extraneous light in the camera spoiled the photograph”, “relying upon an extraneous income”, “disdaining outside pressure groups”
(s)external, international, outsidefrom or between other countries“external commerce”, “international trade”, “developing nations need outside help”
(s)externalpurely outward or superficial“external composure”, “an external concern for reputation” (A.R.Gurney,Jr.)