Definition of filter verb from the Oxford Advanced Learner's Dictionary

     

    filter

     verb
    verb
    BrE BrE//ˈfɪltə(r)//
     
    ; NAmE NAmE//ˈfɪltər//
     
    Verb Forms present simple I / you / we / they filter
    BrE BrE//ˈfɪltə(r)//
     
    ; NAmE NAmE//ˈfɪltər//
     
    he / she / it filters
    BrE BrE//ˈfɪltəz//
     
    ; NAmE NAmE//ˈfɪltərz//
     
    past simple filtered
    BrE BrE//ˈfɪltəd//
     
    ; NAmE NAmE//ˈfɪltərd//
     
    past participle filtered
    BrE BrE//ˈfɪltəd//
     
    ; NAmE NAmE//ˈfɪltərd//
     
    -ing form filtering
    BrE BrE//ˈfɪltərɪŋ//
     
    ; NAmE NAmE//ˈfɪltərɪŋ//
     
    Motoring problems and accidents
     
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  1. 1[transitive] filter something to pass liquid, light, etc. through a special device, especially to remove something that is not wanted All drinking water must be filtered. Use a sun block that filters UVA effectively. (figurative) My secretary is very good at filtering my calls (= making sure that calls that I do not want do not get through). see also filtration Wordfinderabsorb, condense, dilute, dissolve, evaporate, filter, immerse, liquid, rinse, saturated
  2. 2[transitive] filter something to use a special program to check the content of emails or websites before they are sent to your computer
  3. 3[intransitive] + adv./prep. (of people) to move slowly in a particular direction The doors opened and people started filtering through.
  4. 4[intransitive] + adv./prep. (of information, news, etc.) to slowly become known More details about the crash are filtering through.
  5. 5[intransitive] + adv./prep. (of light or sound) to come into a place slowly or in small amounts Sunlight filtered in through the curtains.
  6. 6[intransitive] (British English) (of traffic at traffic lights) to turn left at traffic lights while other vehicles wanting to go straight ahead or turn right must wait See related entries: Motoring problems and accidents
  7. Word Origin late Middle English (denoting a piece of felt): from French filtre, from medieval Latin filtrum ‘felt used as a filter’, of West Germanic origin and related to felt.Extra examples My secretary is very good at filtering my calls. The air was improving as the recyclers filtered out the smoke. Use a sunblock that filters UVA effectively. Phrasal Verbsfilter somethingout
See the Oxford Advanced American Dictionary entry: filter