volunteer - definition and synonyms

noun [countable] 

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  1. 1
    someone who is not paid for the work that they do

    a volunteer worker

    volunteer for:

    He is a volunteer for the Gay Helpline.

  2. 2
    someone who offers to do something without being forced

    Can I have a volunteer to clean the board, please?

    volunteer for:

    Doctors need 50 healthy volunteers for the diet.

  3. 3
    someone who joins the armed forces without being forced