voluntary

adjective
B2+
OPAL
1
B2+
done willingly, not because you are forced
داوطلبانه, اختیاری, ارادی, دلخواه, بامیل
opposite compulsory
2
B2+
done by people who choose to do it without being paid
داوطلبانه, اختیاری, غیر اجباری, تطوعی, بر مبنای اختیار
I do some voluntary work at the local hospital.
She works there on a voluntary basis.
voluntary services/bodies/agencies/organizations
the voluntary sector
3
B2+
doing a job without wanting to be paid for it
داوطلبانه
The homeless hostel is staffed by voluntary workers.
4
that you can control
ارادی
opposite involuntary
noun
1
a piece of music played before, during or after a church service, usually on an organ
مقدمه موسیقایی