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The Collaborative International Dictionary
In situ

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.

  2. (Med.) In its original position; not extending beyond the place of origin; localized and undisturbed; as, carcinoma in situ.

Douglas Harper's Etymology Dictionary
in situ

Latin, literally "in its (original) place or position" (see situate (v.)).

Wiktionary
in situ

a. in its original position or place adv. in its original position or place

WordNet
in situ

adv. in the original or natural place or site; "carcinoma in situ"; "the archeologists left the pottery in place" [syn: in place]

Wikipedia
In situ

In situ ( or ; often not italicized in English) is a Latin phrase that translates literally to "on site" or "in position". It means "locally", "on site", "on the premises" or "in place" to describe an event where it takes place, and is used in many different contexts. For example, in fields such as physics, chemistry, or biology, in situ may describe the way a measurement is taken, that is, in the same place the phenomenon is occurring without isolating it from other systems or altering the original conditions of the test.