im·​pac·​tion | \ im-ˈpak-shən How to pronounce impaction (audio) \

Definition of impaction

: the act of becoming or the state of being impacted especially : lodgment of something (such as feces) in a body passage or cavity

Examples of impaction in a Sentence

Recent Examples on the Web The four mechanisms are inertial impaction, interception, diffusion, and electrostatic attraction. USA Today, 7 Jan. 2022 Fecal impaction is most common in the elderly and in patients with neurodegenerative illnesses like Parkinson's. Colleen Stinchcombe,, 13 Oct. 2021 Several conditions can cause vomiting, including fecal impaction, so your best bet is to get to your doctor quickly for an assessment. Colleen Stinchcombe,, 8 Oct. 2021 Fernandez explains that small particles get removed by diffusion and larger ones by impaction. Joe Lindsey, Outside Online, 30 Sep. 2020 Just 35 percent of US companies have analyzed the near-term impact of the departure of older workers and just 17 percent have considered longer-term impactions over the next decade, according to the survey. Mark Miller, The Christian Science Monitor, 21 June 2018 The monthly expressing of the sacs helps with the impaction, but your dog might still be feeling some discomfort, which is soothed by dragging her bottom on something soft. Joan Morris, The Mercury News, 16 Jan. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'impaction.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of impaction

1739, in the meaning defined above

Learn More About impaction

Time Traveler for impaction

Time Traveler

The first known use of impaction was in 1739

See more words from the same year

Dictionary Entries Near impaction




See More Nearby Entries 

Statistics for impaction

Last Updated

18 Jan 2022

Cite this Entry

“Impaction.” Dictionary, Merriam-Webster, Accessed 28 Jan. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for impaction


im·​pac·​tion | \ im-ˈpak-shən How to pronounce impaction (audio) \

Medical Definition of impaction

: the act of becoming or the state of being impacted specifically : lodgment or an instance of lodgment of something (as a tooth or feces) in a body passage or cavity


Test Your Vocabulary

Name that Thing: Flower Edition

True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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