disinfection

noun

plural disinfections
: the act of disinfecting something
especially : the process of using a disinfectant to destroy, inactivate, or significantly reduce the concentration of pathogenic agents (such as bacteria, viruses, and fungi)
Both viruses are susceptible to disinfection by a weak solution of chlorine bleach. Margaret Reister
… a virulent strain of antibiotic-resistant bacteria spreads beyond hospital walls, some communities are taking extreme measures such as closing schools for disinfection. Laura Landro

Examples of disinfection 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.
Deeper cleaning and disinfection are rarely needed outside of specific situations like an outbreak. Ashley Lynch, Kansas City Star, 18 Aug. 2026 Repairs should be completed by licensed contractors and followed by disinfection and certified testing before the system returns to use. Andrew J. Whelton, The Conversation, 11 Aug. 2026 The tower underwent disinfection Tuesday and will be retested within three to seven days, according to county officials. Elijah Westbrook, CBS News, 30 July 2026 The Guggenheim is among 19 of the buildings which have already finished disinfection, with the others expected to be completed by Saturday. Brie Stimson, FOXNews.com, 12 July 2026 See All Example Sentences for disinfection

Word History

First Known Use

1722, in the meaning defined above

Time Traveler
The first known use of disinfection was in 1722

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Cite this Entry

“Disinfection.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/disinfection. Accessed 26 Aug. 2026.

Medical Definition

disinfection

noun
: the act of disinfecting something
especially : the process of using a disinfectant to destroy, inactivate, or significantly reduce the concentration of pathogenic agents (such as bacteria, viruses, and fungi)
In the past, many … devices (such as flexible endoscopes) could not be sterilized in a reasonable time frame for practical clinical use. The compromise was to recommend high-level disinfection, thereby inactivating most pathogenic micro-organisms such as viruses, bacteria …, fungi and, if possible, bacterial spores … G. McDonnell and P. Burke, Journal of Hospital Infection
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