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English definition of “active”

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active

adjective uk   /ˈæk.tɪv/ us  

active adjective (BUSY)

B1 busy with a particular activity: physically/mentally active You have to try to keep active as you grow older.
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active adjective (INVOLVED)

B2 involved in a particular activity: Enemy forces remain active in the mountainous areas around the city. She's very active in (= involved in) local politics. Both of his parents were very politically active. It is important to educate children before they become sexually active. He takes a more active role in the team nowadays. She's an active member of her trade union (= not only belongs to it, but does work to help it).
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active adjective (VOLCANO)

C1 An active volcano is one that might erupt (= throw out hot liquid rock or other matter) at any time.

active adjective (GRAMMAR)

B1 language An active verb or sentence is one in which the subject is the person or thing that performs the stated action: "Catrin told me" is an active sentence, and "I was told by Catrin" is passive.
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active

noun [S] uk   /ˈæk.tɪv/ us  
the active →  the active voice
(Definition of active from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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