in situ

[ in sahy-too, -tyoo, see-; Latin in sit-oo ]
See synonyms for in situ on
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.

    • 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 Latin in sitū literally, “in place”

Words Nearby in situ Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

British Dictionary definitions for in situ

in situ

/ Latin (ɪn ˈsɪtjuː) /

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

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

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.