external has 3 distinct synonyms spread across 2 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is internal.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
happening or arising or located outside or beyond some limits or especially surface
“the external auditory canal”
coming from the outside
“extraneous light in the camera spoiled the photograph”
1 of the 5 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for external.
Synonyms, antonyms and the broader and narrower relations for external come from Princeton University’s WordNet. Full sources and licences.
outward features
“he enjoyed the solemn externals of religion”