in situ

[ in -sahy-too, -tyoo, see-; Latin in -sit-oo ]
/ ɪn ˈsaɪ tu, -tyu, ˈsi-; Latin ɪn ˈsɪt u /

adverb, adjective

situated in the original, natural, or existing place or position: The archaeologists were able to date the vase because it was found in situ.
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 Latin in sitū literally, “in place”
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for in situ

in situ
/ Latin (ɪn ˈsɪtjuː) /

adverb, adjective (postpositive)

in the natural, original, or appropriate position
pathol (esp of a cancerous growth or tumour) not seen to be spreading from a localized position
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

Medical definitions for in situ

in situ
[ ĭn sītōō ]

adj.

In the original position.
Confined to the site of origin.

Other words from in situ

in situ adv.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Cultural definitions for in situ

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 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.