Meaning of “filter” in the English Dictionary

"filter" in British English

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filternoun [ C ]

uk /ˈfɪl.tər/ us /ˈfɪl.t̬ɚ/

filter noun [ C ] (EQUIPMENT)

C2 any of several types of equipment or devices for removing solids from liquids or gases, or for removing particular types of light:

a water filter
a dust filter
Ozone is the earth's primary filter for ultraviolet radiation.

a thin piece of plastic or glass placed in front of a camera lens in order to change the colour or amount of light entering it:

I like to experiment with different light filters on my camera.

a tool for selecting or removing a particular type of information:

You can apply filters to capture the most relevant data.

a tool for creating special effects on an image:

There's a filter that makes all your pictures look like old sepia photographs.
Instagram/Snapchat filters

filterverb

uk /ˈfɪl.tər/ us /ˈfɪl.t̬ɚ/

(Definition of “filter” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"filter" in American English

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filternoun [ C ]

us /ˈfɪl·tər/

a piece of equipment or a device for removing solids from liquids or gases, or for limiting the particular type of light, sound, or electricity going through it:

an oil filter
a coffee filter

filterverb [ I/T ]

us /ˈfɪl·tər/

If something filters down, in, out, or through, it appears or happens gradually or to a limited degree:

[ I always + adv/prep ] Reports of the accident began to filter in.
[ I always + adv/prep ] Sunlight filtered through the branches.

(Definition of “filter” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"filter" in Business English

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filternoun [ C ]

uk /ˈfɪltər/ us IT

a computer program that receives and processes information before displaying it or preventing it from being seen:

Junk email filters help define which email messages are spam.

filterverb [ T ]

uk /ˈfɪltər/ us IT

to use a computer program to process information before displaying it or preventing it from being seen:

The company, whose products filter email and internet content, confirmed a record second quarter yesterday.
filtering
noun [ U ]

Email filtering is the removal of unwanted email, for example spam or a phishing attempt, before it reaches your mailbox.

(Definition of “filter” from the Cambridge Business English Dictionary © Cambridge University Press)