主動

Simplified: 主动

On the HSK 3 vocabulary list, at CEFR level B1.

zhǔdòng ㄓㄨˇ ㄉㄨㄥˋ

- to take the initiative
- to do sth of one's own accord
- spontaneous
- active
- opposite: passive 被動|被动[bei4 dong4]
- drive (of gears and shafts etc)

Sources