A more thorough explanation:

Definition: Immune, adjective. Having protection from a disease or illness; not affected by something.

Examples:

• After getting the flu shot, I am now immune to the flu virus.
• Some people are immune to poison ivy and can touch it without getting a rash.
• Because of his diplomatic status, the ambassador was immune from prosecution.

The examples illustrate the definition of immune by showing situations where someone or something is protected from harm or liability. In the first example, the person is protected from getting the flu because they have immunity from the virus. In the second example, some people have a natural immunity to poison ivy, which means they are not affected by it. In the third example, the ambassador is exempt from prosecution because of their diplomatic status, which means they are immune from legal liability.