Legislation is the law — the written rules that get passed. A legislature is the assembly of people who pass them. "Parliament approved legislation banning single-use plastics" describes the law; "the state legislature sits for ninety days a year" describes the institution.
The core difference
One is a product, the other is a producer. Legislation is what comes out of the process: statutes, acts, bills once enacted. A legislature is the chamber or chambers doing the enacting — Parliament, Congress, the Scottish Parliament, a state assembly.
Using each one
Legislation is an uncountable noun. That single fact prevents most errors. You cannot write "a legislation" or "three legislations"; you write "a piece of legislation", "two pieces of legislation", or simply "legislation".
- "The legislation takes effect in April."
- "Campaigners want tougher legislation on landlords."
- "The legislature adjourned without voting."
- "Both houses of the legislature approved the budget."
A legislature, by contrast, is countable and refers to a group of people (and, loosely, the building they sit in). Fifty US states have fifty legislatures.
The test
Substitute the plain word. If laws or a law fits, you want legislation. If parliament, assembly or lawmakers fits, you want legislature. "The legislature passed the legislation" is the sentence that shows both slotting in correctly — the lawmakers passed the law.
The memory trick
Legislature shares its ending with structure, architecture and judicature — all institutions and edifices. Legislation shares its ending with regulation and documentation — all paperwork. Building or paperwork: pick accordingly.
The family of related words
Two more words in the set trip people up:
- Legislator — one person who makes laws. A legislature is full of legislators.
- Legislative — the adjective. "Legislative session", "legislative history", "the legislative branch". Note that "the legislative branch" and "the legislature" mean roughly the same thing, which is why the adjective feels interchangeable with the noun.
The mistake to watch for
The commonest slip in news writing is treating legislation as countable: "MPs debated several legislations." Rewrite as "several bills" or "several pieces of legislation". The second commonest is using legislature when you mean the law: "the new legislature bans vaping in schools" — a legislature bans nothing on its own; it votes for legislation that does.
One more nuance worth knowing: legislation can also name the act of legislating ("legislation on this scale takes years"), which is why it resists a plural. The people doing it are always the legislature.
Frequently Asked Questions
Is it 'a legislation' or 'a piece of legislation'?
"A piece of legislation." Legislation is uncountable in standard English, so it takes no indefinite article and no plural. If you need to count, use bills, acts or pieces of legislation.
Does legislature mean the building or the people?
Primarily the people — the elected body that makes law. It is often used loosely for the building they meet in, the way "the White House" stands for an administration, but the core meaning is the assembly itself.
What is the difference between legislation and a bill?
A bill is a proposal that has not yet passed. Once a legislature approves it and it becomes law, it is legislation (or an act). Journalists often call bills "proposed legislation" while they are still being debated.