fil·​tra·​tion | \fil-ˈtrā-shən \

Definition of filtration 

1 : the process of filtering

2 : the process of passing through or as if through a filter also : diffusion

Examples of filtration in a Sentence

Recent Examples on the Web

Keep doors and windows closed when your allergens are plentiful, and use filtration systems, too. Colleen Stinchcombe, SELF, "13 Ways to Triumph Over Fall Allergies," 13 Nov. 2018 His filtration systems are for sale and have been shipping all over the world. Jack Fisher, The Seattle Times, "Group screens and cleans sand near Oregon’s Haystack Rock," 20 Aug. 2018 Name: Chris Lisk Patent: Self-Contained Swimming Pool, a design for a complete mobile swimming pool with a heater and filtration system, built into a roll-off dumpster for easy transport. Popular Mechanics, "My Job at Coachella Inspired Me to Invent a Portable Swimming Pool," 30 Oct. 2018 Fernandez said the city could expand its groundwater reserves for the future, which would require other filtration processes. Molly Harbarger,, "Salem water sees decrease in toxins, while Wilsonville sees increase," 1 June 2018 Duties involve sampling water during different stages of the filtration process to ensure effectiveness and efficiency, the contract reads. Rick Kambic,, "Libertyville and Mundelein to share wastewater plant employee," 25 May 2018 Wrapped in aluminum, glass and steel, the structure features space for 25 vehicles, aluminum acoustic wall panels for sound absorption and a computerized air-filtration system that is ideal for preserving vintage autos. Neal J. Leitereg,, "Home of the Week: One bedroom, and a garage for 25 cars, for $10 million in Malibu," 28 Apr. 2018 Read more: Quagga mussels now cover much of the Lake Michigan bottom, and its their immense amount of filtration that is reducing E. coli counts. Keith Matheny, Detroit Free Press, "Surprising species helps Lake Michigan E. coli levels," 25 May 2018 The vacuum comes with an extra level of filtration to help get rid of pesky allergens and can be used on a ton of different surfaces like carpets, upholstery, stairs, counter tops, and hard floors. Lindsey Murray, Good Housekeeping, "This Popular Bissell Vacuum Is $60 on Amazon Today," 4 Apr. 2018

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

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First Known Use of filtration

1602, in the meaning defined at sense 1

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Last Updated

27 Nov 2018

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The first known use of filtration was in 1602

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English Language Learners Definition of filtration

: the act or process of removing something unwanted from a liquid, gas, etc., by using a filter


fil·​tra·​tion | \fil-ˈtrā-shən \

Kids Definition of filtration

: the process of filtering


fil·​tra·​tion | \fil-ˈtrā-shən \

Medical Definition of filtration 

1 : the process of filtering

2 : the process of passing through or as if through a filter also : diffusion the kidney produces urine by filtration

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More from Merriam-Webster on filtration

Rhyming Dictionary: Words that rhyme with filtration

Spanish Central: Translation of filtration

Nglish: Translation of filtration for Spanish Speakers

Britannica English: Translation of filtration for Arabic Speakers

Comments on filtration

What made you want to look up filtration? Please tell us where you read or heard it (including the quote, if possible).


the figure or shape of a crescent moon

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