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/

filter verb (APPEAR GRADUALLY)

C2 [ I + adv/prep ] to appear or happen gradually or to a limited degree:

News filtered down to us during the day.
Reports about an accident began to filter in.
Sunlight filtered through the branches.

Phrasal verb(s)

(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)