voluntary
英 ['vɒlənt(ə)rɪ]
美['vɑləntɛri]
- adj. 自愿的；志愿的；自发的；故意的
- n. 志愿者；自愿行动
英英释意
- 1. (military) a person who freely enlists for service
- 2. composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a service or performance