In a manner that is native to or originating from a particular place; without being brought from elsewhere.
The adverb form created by adding -ly to autochthonous. The -ly suffix transforms the adjective into an adverb that describes how something happens or exists.
Adding -ly to create an adverb seems simple, but it reveals something cool about English: we can turn almost any adjective into an adverb to describe actions or states. 'The fish evolved autochthonously in this lake' sounds scientific and precise.
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