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English definition of “volunteer”

volunteer

noun [C] uk   /ˌvɒl.ənˈtɪər/ us    /ˌvɑː.lənˈtɪr/
B2 a person who does something, especially helping other people, willingly and without being forced or paid to do it: The Health clinic is relying on volunteers to run the office and answer the phones. Since it would be a highly dangerous mission, the Lieutenant asked for volunteers. It's a volunteer army with no paid professionals.
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volunteer

verb uk   /ˌvɒl.ənˈtɪər/ us    /ˌvɑː.lənˈtɪr/
C1 [I or T] to offer to do something that you do not have to do, often without having been asked to do it and/or without expecting payment: [+ to infinitive] During the emergency many staff volunteered to work through the weekend. I volunteered myself for the post of Health and Safety Representative. My mates volunteered me to do the talking. He volunteered for the army (= he joined even though he did not have to). [T] to give information without being asked: If I were you, I wouldn't volunteer any details of what happened. [+ speech] "I saw her going out of the main entrance at about half past two," he volunteered.
(Definition of volunteer from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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