a.

1. 自愿的，志愿的
   She was a voluntary helper.

   她是自愿帮忙的。

2. 有意的，故意的
   voluntary manslaughter

   蓄意谋杀

3. 靠自由捐助维持的[B]
   Mr. Smith did a lot of work for a voluntary organization.

   史密斯先生为一民办组织做了很多工作。

4. 【解】随意的
5. 自发的；自觉的
   voluntary laughter

   情不自禁的大笑

6. 【律】自愿的；无偿的
   He made a voluntary statement to the police.

   他自动向警方陈述。

n.[C]

1. 自愿行动
2. 志愿者
3. （教堂礼拜前后所演奏的）风琴独奏

adj.

1. done, given, or acting of one's own free will.
   ▸Physiology  under the conscious control of the brain.
2. working or done without payment.
   ▸Law  (of a conveyance or disposition) made without return in money or other consideration.

n.

1. an organ solo played before, during, or after a church service.
   ▸historical a piece of music performed extempore or composed in a free style.
2. (in a competition) a special performance left to the performer's choice.