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English definition of “volunteer”

volunteer

noun [C]  /ˌvɑl·ənˈtɪr/ us  
a person who does something, esp. for other people or for an organization, willingly and without being forced or paid to do it: The charity relies on volunteers to run the office and answer the phones.

volunteer

verb [I/T]  /ˌvɑl·ənˈtɪər/ us  
to do something, esp. for other people or for an organization, willingly and without being forced or paid to do it: [+ to infinitive] During the emergency a lot of people volunteered to work through the night. [T] Three physicians volunteered their services.
(Definition of volunteer from the Cambridge Academic Content Dictionary © Cambridge University Press)
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