in situ

adverb or adjective

in si·​tu (ˌ)in-ˈsī-(ˌ)tü How to pronounce in situ (audio)
-ˈsi-,
-(ˌ)tyü How to pronounce in situ (audio)
 also  -ˈsē-,
-(ˌ)chü How to pronounce in situ (audio)
: in the natural or original position or place
an in situ cancer confined to the breast duct

Examples of in situ in a Sentence

Recent Examples on the Web Perseverance’s in situ studies of the samples already hint at the ancient lake’s highly dynamic environment, and the minerals preserved in these rocks represent a treasure trove for future scientists to examine. Robin Wordsworth, Scientific American, 26 June 2024 Her medical team advised her to undergo a double mastectomy, a surgical procedure which removes both breasts, during which doctors found a small section of ductal carcinoma in situ, an early form of breast cancer. Jay Stahl, USA TODAY, 17 Apr. 2024 Designs inspired by dew drops on a spider’s web were hand beaded and crocheted and overlayed in situ with a silvery chainmail, then adorned with tear drop pearls or crystals. Alex Wynne, WWD, 3 Sep. 2019 Most Deutsche employees are required to work three days in the office while managing directors need to be in situ four days a week. Byryan Hogg, Fortune Europe, 18 June 2024 See all Example Sentences for in situ 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'in situ.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

Latin, in position

First Known Use

1740, in the meaning defined above

Time Traveler
The first known use of in situ was in 1740

Dictionary Entries Near in situ

Cite this Entry

“In situ.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20situ. Accessed 20 Jul. 2024.

Kids Definition

in situ

adverb or adjective
in si·​tu (ˈ)in-ˈsī-t(y)ü How to pronounce in situ (audio)
-ˈsi-
: in the natural or original position
the cancer cells remained in situ
Etymology

Latin, "in position"

Medical Definition

in situ

adverb or adjective
in si·​tu
(ˈ)in-ˈsī-(ˌ)t(y)ü, -ˈsi- also -ˈsē-, -(ˌ)chü
: in the natural or original position or place
an in situ cancer confined to the breast duct
see carcinoma in situ
Last Updated: - Updated example sentences
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