WordGarden.iofilter
B1Pronunciation
UK
- /fˈɪltə/
US
- /ˈfɪltər/
Meanings
Noun
a device or material that removes unwanted substances or blocks certain elements
a software control or rule that limits or selects data, messages, or results
an effect or setting that changes the appearance of an image
Verb
to pass something through a filter to remove or block parts of it
to limit, sort, or select digital content or data by criteria
to pass or spread gradually through something
Beyond the definition
Imagine pouring coffee grounds into hot water: a filter keeps the grounds out of your cup. That's one way to think about "filter." But it is much more than something you use for liquids. A filter can be anything that separates things, whether in a physical way or in your mind. Social media platforms filter what content you see, and our brains filter out unimportant information all the time. You might even say a good friend filters your bad ideas before you act on them.
The word's roots go back to Medieval Latin, where it referred to felt or cloth used for straining liquids. Now it is also about selection: choosing what gets through and what does not. A clogged filter needs cleaning, just like a mind full of information might need some quiet time to sort things out.
To filter something means to pass it through a medium that separates certain elements from others. This can be literal, as in using a coffee filter to remove grounds from liquid, or an air filter to clean the air you breathe. Phrases like "the water was filtered before drinking" show purification and the removal of unwanted material.
However, "filter" also works metaphorically. We filter information—meaning we selectively process what is important and ignore the rest. A news organization might filter stories, choosing which ones to report on. Social media algorithms filter your feed based on your preferences. You can even filter your own thoughts or emotions, trying to focus on positive aspects while minimizing negative ones.
As a noun, a "filter" is the device or process that does the separating. "The engine needs a new oil filter." But it also refers to digital tools used for selection or aesthetics: "She applied a vintage filter to her photograph."
Historically, filters were often made from cloth or other porous materials. Today, they can be complex systems involving membranes, chemicals, and even computer code.
So whether you're brewing coffee, cleaning air, sifting through information, or shaping an image, filter is about the process of selection—deciding what gets through and what stays behind.
Examples
- 1
Car maintenance
I need to replace the air filter in my car.
- 2
Natural light
Morning light filtered through the thin curtains.
- Patternfilter through
pass through slowly
- 3
Search results
You can filter the search results by date or price.
- Patternfilter by
limit what you see using one condition
- 4
Email spam
The system automatically filters out spam emails.
- Patternfilter out
remove from a group
More examplesFewer examples
- 5
Parental controls
Parents often use apps to filter what their children can see online.
- 6
Photo editing
That photo would look better without the vintage filter.
- 7
Rumor control
Try to filter out the rumors and focus on the facts.
- 8
Blunt speech
He talks without a filter when he's upset.
- Phrasewithout a filter
without thinking enough before speaking
See also
Similar
Shades of meaning
Contrast
Used with (collocations)
- coffee filter
- air filter
- water filter
Word family
Explore
Forms and spellings
4 forms open this card.
Main spelling
- filternounverb
Forms
- filterspluralnounverb
- filtering-ing formverbnoun
- filteredpast tenseverbnoun