diminution

noun

dim·​i·​nu·​tion ˌdi-mə-ˈnü-shən How to pronounce diminution (audio)
 also  -ˈnyü-
: the act, process, or an instance of becoming gradually less (as in size or importance) : the act, process, or an instance of diminishing : decrease
a diminution in value

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In his late 14th century tragic poem Troilus and Criseyde, Geoffrey Chaucer employed the word diminution, contrasting the verb encrece (“increase”) with the phrase “maken dyminucion” (“make diminution”). Like many words Chaucer used, diminution came to English from Anglo-French, and ultimately from the Latin word deminuere, meaning “to diminish,” which is also an ancestor of the English verb diminish. That word entered the language in the 15th century, and the related noun diminishment, a synonym of diminution, was adopted in the 16th century.

Examples of diminution in a Sentence

a diminution of 60 percent over the course of the month
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.
Maryland has a diminution credit system in which some inmates can earn a reduction in their sentence. Mirna Alsharif, NBC news, 2 Sep. 2025 But rather than Xi’s diminution, the recent moves more likely reflect Xi’s continued dominance of the military. Jonathan A. Czin, Foreign Affairs, 18 Aug. 2025 Between the diminution of the room and the presence of the attendees, and the ability to interact with objects in a 3D space, the result is one of being there in the same moment, engaging with the same things. Ray Ravaglia, Forbes.com, 12 Aug. 2025 There are many worthwhile ways to write about the arts, but her sniping at reviews suggests a faux expansion that would actually be a grave diminution. Richard Brody, New Yorker, 24 July 2025 See All Example Sentences for diminution

Word History

Etymology

Middle English diminucioun, from Anglo-French diminutiun, from Medieval Latin diminution-, diminutio, alteration of Latin deminution-, deminutio, from deminuere "to lessen" — more at diminish

First Known Use

14th century, in the meaning defined above

Time Traveler
The first known use of diminution was in the 14th century

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Cite this Entry

“Diminution.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diminution. Accessed 17 Oct. 2025.

Kids Definition

diminution

noun
dim·​i·​nu·​tion ˌdim-ə-ˈn(y)ü-shən How to pronounce diminution (audio)
: the act, process, or an instance of diminishing : decrease

Legal Definition

diminution

noun
dim·​i·​nu·​tion ˌdi-mə-ˈnü-shən, -ˈnyü- How to pronounce diminution (audio)
: the act, process, or an instance of making less
diminution of access to health careU.S. Code

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