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in situ

[in sahy-too, -tyoo, see-; Latin in sit-oo]
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adverb, adjective
  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.
    1. in place or position; undisturbed.
    2. (especially of a malignant tumor) in a localized state or condition: carcinoma in situ.
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Origin of in situ

First recorded in 1730–40, in situ is from the Latin word in sitū literally, in place
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for in situ

in situ

adverb, adjective (postpositive)
  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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for in situ

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

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Online Etymology Dictionary, © 2010 Douglas Harper

in situ in Medicine

in situ

(ĭn sītōō)
adj.
  1. In the original position.
  2. Confined to the site of origin.
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Related formsin situ adv.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

in situ in Culture

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.”

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.