1 done or given because you want to do it, not because you have to do it 自愿的；自动的；自发的: He took voluntary redundancy and left the firm last year. 他自愿离职，去年离开了那家公司。 [OPP] compulsory 反义词为compulsory

2 done or working without payment 义务的；无偿的: She does some voluntary work at the hospital. 她在医院做些义务工作。

3 (used about movements of the body) that you can control （指身体的动作）可自主的，随意的 [OPP] involuntary 反义词为involuntary➔voluntarily /ˈvɒləntrəli; US ˌvɒlənˈterəli ||; ˌvɑlənˈtɛrəlɪ/ adv She left the job voluntarily, she wasn't sacked. 她是自愿离职，不是给辞退的。