Definitions
1.noun(chiefly in the plural) The exterior; outward features or appearances.
2.nounIn the C programming language, a variable that is defined in the source code but whose value comes from some external source.
3.adjectiveOutside of something; on the exterior."This building has some external pipework."
4.adjectiveNot intrinsic nor essential; accidental; accompanying; superficial.
5.adjectiveForeign; relating to or connected with foreign nations."external trade or commerce; the external relations of a state or kingdom"
6.adjectiveAway from the mesial plane of the body; lateral.
7.adjectiveProvided by something or someone outside of the entity (object, group, company etc.) considered.