in si·tu

[in sahy-too, -tyoo, see-; Latin in sit-oo]
noun
1.
situated in the original, natural, or existing place or position: The archaeologists were able to date the vase because it was found in situ.
2.
Medicine/Medical.
a.
in place or position; undisturbed.
b.
in a localized state or condition: carcinoma in situ.

Origin:
1730–40; < Latin in sitū literally, in place

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
in situ (ɪn ˈsɪtjuː) [Click for IPA pronunciation guide]
 
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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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
In situ is always a great word to know.
So is lollapalooza. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
American Heritage
Medical Dictionary

in situ in si·tu (ĭn sī't&oomacr;)
adj.

  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
Basically, at the kind of distance for this object, you cannot form a gas giant
  in situ by accretion.
The composite fills the crack and then hardens in situ.
To measure sublimation, one has to regularly weigh samples of ice in situ.
The enrichment of homozygotes is unexpected if selection in situ is occurring
  here.
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