1. a person who voluntarily offers himself or herself for a service or undertaking.
2. a person who performs a service willingly and without pay.
3. Military. a person who enters the service voluntarily rather than through conscription or draft, especially for special or temporary service rather than as a member of the regular or permanent army.
4. Law. a person whose actions are not founded on any legal obligation so to act. a person who intrudes into a matter that does not concern him
"workers can be volunteer."
"forces can be volunteer."
"groups can be volunteer."
"helps can be volunteer."
"services can be volunteer."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.