in situ
adverb or adjective
in si·tu
(ˌ)in-ˈsī-(ˌ)tü 
-ˈsi-,
-(ˌ)tyü
also -ˈsē-,
-(ˌ)chü
: 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
To delineate the murine C3aR coding sequence, gene structure, 5′-flanking region, and chromosome location, cDNA and genomic clones encoding the mouse C3a receptor were isolated, characterized, and used in fluorescence in situ hybridization experiments.
—
Kirstin R.w. Matthews, STAT, 3 Feb. 2026
Abraham was in situ and the challenge of filling this transfer window’s priority position, which had brought so much turbulence, had been met.
—Jacob Tanswell, New York Times, 27 Jan. 2026
Against a background of learning, characters are shaped in situ.
—Literary Hub, 16 Jan. 2026
It also couldn’t be repaired in situ.
—Christopher McFadden, Interesting Engineering, 11 Jan. 2026
See All Example Sentences for in situ
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Kirstin R.w. Matthews, STAT, 3 Feb. 2026
Abraham was in situ and the challenge of filling this transfer window’s priority position, which had brought so much turbulence, had been met.
—Jacob Tanswell, New York Times, 27 Jan. 2026
Against a background of learning, characters are shaped in situ.
—Literary Hub, 16 Jan. 2026
It also couldn’t be repaired in situ.
—Christopher McFadden, Interesting Engineering, 11 Jan. 2026
See All Example Sentences for in situ
Cite this Entry
“In situ.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20situ. Accessed 6 Feb. 2026.
Copy CitationKids Definition
in situ
adverb or adjective
in si·tu
(ˈ)in-ˈsī-t(y)ü
-ˈsi-
: in the natural or original position
the cancer cells remained in situ
Etymology
Latin, "in position"
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