'In situ' definitions:

Definition of 'in situ'

(from WordNet)
adverb
In the original or natural place or site; "carcinoma in situ"; "the archeologists left the pottery in place" [syn: in situ, in place]

Definition of 'In situ'

From: GCIDE
  • In situ \In si"tu\adv. & adj. [L.]
  • 1. In its natural or original position or place; in position; -- said specif., in geology, of a rock, soil, or fossil, when in the situation in which it was originally formed or deposited. [Webster 1913 Suppl.]
  • 2. (Med.) In its original position; not extending beyond the place of origin; localized and undisturbed; as, carcinoma in situ. [PJC]