in situ

[in sahy-too, -tyoo, see-; Latin in sit-oo]
situated in the original, natural, or existing place or position: The archaeologists were able to date the vase because it was found in situ.
in place or position; undisturbed.
in a localized state or condition: carcinoma in situ.

1730–40; < Latin in sitū literally, in place Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
in situ (ɪn ˈsɪtjuː)
adv, —adj
1.  in the natural, original, or appropriate position
2.  pathol (esp of a cancerous growth or tumour) not seen to be spreading from a localized position

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

in situ in si·tu (ĭn sī'tōō)

  1. In the original position.

  2. Confined to the site of origin.

in situ adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
in situ [(in seye-tooh, in sit-ooh)]

In the original place or arrangement: “The body was left in situ until the police arrived.” From Latin, meaning “in position.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
To measure sublimation, one has to regularly weigh samples of ice in situ.
In other words the cementing material formed in situ and was not collected and
  formed separately into another structure.
These days, the consensus among conservationists is to try to manage nature
  with humans in situ.
The composite fills the crack and then hardens in situ.
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