Outside of something; on the exterior.
This building has some external pipework.
Capable of being perceived outwardly.
Provided by something or someone outside of the entity (object, group, company etc.) considered.
external authority, external force
The exterior; outward features or appearances.
To a non-Christian who has never experienced but only observed the externals of Christianity, it appears to be merely another spiritual system, but to a person who has left one of the other religions and embraced the Christian faith, it is most definitely The Way, and all else pales to insignificance.
From Late Middle English, from Medieval Latin externus (“outward, external”), from exter/exterus (“on the outside, outward”).
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A variable that is defined in the source code but whose value comes from some external source.