There are multiple definitions - click on the translation that matches your context.

lei

substantivo

full

act

noun

Comparative law notes

Brazil

In Brazil, pieces of legislation are usually referred to by either a number (e.g. lei n° 6.404/76) or a name (e.g. Lei das SA). When translating into English, use Law when mentioning the number (e.g. Law No. 6,404) and Act when mentioning the name (e.g. Corporation Act).

Definitions of act

English

a law, rule or formal decision made by the legislature or other law-makers

The Human Rights Act is not just a normal Act of Parliament that can be repealed or amended at will.

English

something done by a person for a particular purpose

I don't understand why anyone would want to commit such acts.