志愿 (zhì yuàn) is a noun meaning 'volunteer work' or 'aspiration,' depending on context. The character 志 (zhì) means 'will,' 'purpose,' or 'ambition,' often associated with determination and long-term goals; 愿 (yuàn) means 'wish' or 'desire.' Together, they form a compound that emphasizes intentional, heartfelt commitment—whether to serve others without pay or to pursue a personal ideal. In modern usage, it most commonly refers to unpaid community service (e.g., volunteering at a hospital or school), but in formal or literary contexts, it retains its classical sense of 'lofty aspiration' (e.g., one's life goal or moral calling).

This word appears frequently in official announcements, school activities, and personal narratives. It’s often used with verbs like 做 (to do), 参加 (to participate in), or 实现 (to realize), and commonly modified by adjectives like 公益 (public welfare) or 无私 (selfless). Unlike the verb 志愿 (which is rare and archaic), the noun form is standard and widely understood across all registers.