立法 (lì fǎ) literally means 'to establish law' — 立 (lì) means 'to set up, to establish', and 法 (fǎ) means 'law' or 'statute'. Together, they form a verb meaning 'to legislate' — the formal process of drafting, debating, and enacting laws by a governing body like a national congress or local people's congress. It is used almost exclusively in official, political, or legal contexts, not in everyday casual speech.

The term implies authoritative, institutional action: only authorized bodies (e.g., the National People’s Congress) can truly 'legislate'. It does not refer to personal rules or informal agreements. While it can appear as a noun (e.g., 立法工作 'legislative work'), its core grammatical function is verbal — often followed by an object (e.g., 立法禁止 smoking) or used in passive constructions (e.g., 这项法律正在被立法). It carries a formal, serious register and appears frequently in news reports, policy documents, and academic discussions about governance and rule of law.