volunteer Meaning in Cambridge American English Dictionary
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Meaning of "volunteer" - American English Dictionary

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volunteernoun [C]

 us   /ˌvɑl·ənˈtɪr/
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.

volunteerverb [I/T]

 us   /ˌvɑl·ənˈtɪər/
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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