Filter Meaning
/ˈfɪltə/Definition, CEFR level B1, pronunciation, examples, and quiz.
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Definition
nounA device which separates a suspended, dissolved, or particulate matter from a fluid, solution, or other substance; any device that separates one substance from another.
nounElectronics or software that separates unwanted signals (for example noise) from wanted signals or that attenuates selected frequencies.
Sentence Examples
In swimming pools, water is continuously pumped through a filter.
I don't like filter coffee.
Put the coffee in the filter and let the water run through.
CEFR Practice Quiz
We must replace the dirty water ____ to ensure our drinking water is safe.
CEFR Practice Quiz (Alternate)
The coffee ____ needs to be replaced regularly to ensure that the beverage tastes fresh and clean.
Word Origin & History
From Middle English filtre, from Medieval Latin filtrum (compare also Old French feutre (“felt; filter”)), from Frankish *filtir, from Proto-West Germanic *felt. See felt. Doublet of phin.
Literary Quotations & Historical Citations
"Then add four drops of crocodile semen, and pass the mixture through a filter."
— 1961, Harry E. Wedeck, Dictionary of Aphrodisiacs, New York: The Citadel Press, page 152:
"In America alone, people spent $170 billion on “direct marketing”—junk mail of both the physical and electronic varieties—last year. Yet of those who received unsolicited adverts through the post, only 3% bought anything as a result. If the bumf arrived electronically, the take-up rate was 0.1%. And for online adverts the “conversion” into sales was a minuscule 0.01%. That means about $165 billion was spent not on drumming up business, but on annoying people, creating landfill and cluttering spam filters."
— 2013 May 25, “No hiding place”, in The Economist, volume 407, number 8837, page 74:
"These were women with enormous feelings and, almost always, no filter to mediate their expression of them."
— 2026 January 30, Judy Berman, “Catherine O’Hara Portrayed the Vain and Delusional With a Radical Lack of Vanity”, in TIME, archived from the original on 01 Feb 2026:
"He don't need no filter posting pictures!"
— 2013, Patent Pending, “All-Star Hipster”, in Brighter:
"“You have probably never seen anything like this before, Mr. Toler. It is baleen, or if you prefer it, whalebone, taken from the mouth of the bowhead whale. It is used by the whale to filter its food.”"
— 1954, Alexander Alderson, chapter 5, in The Subtle Minotaur:
Explore More B1 Vocabulary Words
CEFR Practice Quiz
We must replace the dirty water ____ to ensure our drinking water is safe.
CEFR Practice Quiz (Alternate)
The coffee ____ needs to be replaced regularly to ensure that the beverage tastes fresh and clean.