Lawful means allowed by law or following the rules that a society has established. When something is lawful, it's legal and permitted: driving with a valid license is lawful, but speeding through a school zone is not.

The word describes actions that respect the system of rules we've agreed to live by. A lawful action aligns with established legal requirements and procedures. A police officer making a lawful arrest follows proper procedures. A business conducting lawful commerce operates within regulations designed to protect customers and fair competition.

You might hear about someone's lawful rights, meaning the freedoms and protections the law guarantees them. In many countries, freedom of speech is a lawful right. When a judge rules that evidence was obtained through lawful means, she's confirming that investigators followed proper legal procedures.

The opposite of lawful is unlawful or illegal. Notice that lawful doesn't always mean the same as right or just. Throughout history, some lawful things later came to be seen as unjust, which is why societies change their laws over time. But in general, lawful behavior means playing by the established rules, which helps communities function peacefully and fairly.