Etymology
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in situ

1740, Latin, literally "in its (original) place or position," from ablative of situs "site" (see site (n.)).

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Definitions of in situ
1
in situ (adv.)
in position;
in situ (adv.)
in the original or natural place or site;
carcinoma in situ
Synonyms: in place
2
in situ (adj.)
being in the original position; not having been moved;
the archeologists could date the vase because it was in situ
Synonyms: in-situ / unmoved
From wordnet.princeton.edu