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autochthonous has 4 distinct synonyms spread across 1 of its 2 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 allochthonous.
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.
of rocks, deposits, etc.; found where they and their constituents were formed
originating where it is found
“the autochthonal fauna of Australia includes the kangaroo”
Synonyms, antonyms and the broader and narrower relations for autochthonous come from Princeton University’s WordNet. Full sources and licences.