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.
While Horner and Verstappen remain in situ, Red Bull has lost one of its stars as Adrian Newey left after 19 years to join Aston Martin in a deal worth around $40m a season. Dan Cancian, Forbes, 8 Mar. 2025 Ice would be a critical resource for future astronauts, if it can be extracted, because it can be turned into drinking water, air and even rocket fuel, providing in situ resources that otherwise would have to be carried up from Earth. William Harwood, CBS News, 26 Feb. 2025 There have been occasions when supporters worried which division Everton would be in by the time the stadium was completed, but with results improving under manager David Moyes, new owners in situ and the ground almost ready to open, everyone can start to look forward with optimism. Patrick Boyland, The Athletic, 18 Feb. 2025 Minimalist designer De Sarno was in situ for less than two years, after replacing Alessandro Michele, whose maximalist designs defined the brand over previous years. Karen Gilchrist, CNBC, 11 Feb. 2025 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

Browse Nearby Words

Cite this Entry

“In situ.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20situ. Accessed 23 Mar. 2025.

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
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!