Adjective

(-)

Native to the place where found; indigenous.

* 1889 , Justin Winsor, Narrative and Critical History of America , Vol. I, page 375:

Two of the most celebrated of the evolutionists reject the autochthonous view, for Darwin's Descent of Man'' and Haeckel's ''Hist. of Creation consider the American man an emigrant from the old world, whatever way the race may have developed

* {{quote-book, year= 1983

, year_published= , author= (Isaac Asimov) , by= , title= (The Robots of Dawn) , url= , original= , chapter= 22 , section= , isbn= 0-553-29949-2 , edition= , publisher= Bantam Books , location= , editor= , volume= , page= 116 , passage= Only human beings could live on this world and know that they were not autochthonous but had stemmed from Earthmen—and yet did the Spacers really know it or did they simply put it out of their mind? }}

(biology, medicine) Originating where found; found where it originates.

* 1983 , Journal of the Medical Society of New Jersey , volume 80, page 538:

When, in 1858, Joseph Lister amputated the right leg of a six-year-old girl suffering from gangrene, he noted that the autochthonous blood clot extended down the anterior tibial artery as far as the commencement of the gangrene.

(geology) Buried in place, especially of a fossil preserved in its life position without disturbance or disarticulation.

* 1992 , Anna K. Behrensmeyer, et al., Terrestrial Ecosystems Through Time , page 83:

Death and burial may be simultaneous, resulting in a preserved snapshot of an autochthonous assemblage that may be compared directly with present day ecosystems.

Adjective

(-)

first, earliest or original

* Sir W. Hamilton

the primordial facts of our intelligent nature

(biology) characteristic of the earliest stage of the development of an organism, or relating to a primordium

a primordial''' leaf; a '''primordial cell

primeval