[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.
- (especially of a malignant tumor) in a localized state or condition: carcinoma in situ.
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. 2019
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
Latin, literally "in its (original) place or position" (see situate (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
In the original position.
Confined to the site of origin.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
[(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.