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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Danielle Fishel was diagnosed earlier this year with DCIS, or ductal carcinoma in situ, a form of early-stage breast cancer. Tracy Wright, Fox News, 17 Oct. 2024 The songs, some of which made it onto an album released during the pandemic, contain real highs, like an a cappella number that introduces the second act, though there are also darlings that express a feeling well but don’t service the drama in situ. Jackson McHenry, Vulture, 28 Oct. 2024 Following a routine mammogram, the 43-year-old actress—best known for her iconic role as Topanga Lawrence on Boy Meets World—was diagnosed with ductal carcinoma in situ (DCIS) with microinvasion, an early stage of breast cancer. Sandra Rose Salathe, Flow Space, 16 Oct. 2024 Participants will spend time practicing functional repairs in situ, and laying out replacement timbers using 'old school mill rule' techniques thought to have been used during the original construction of the barn. Deb Harvell, arkansasonline.com, 27 Oct. 2024 See all Example Sentences for in situ 

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 26 Dec. 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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