Anonymity (noun)

1. The state of being anonymous.
2. The state of being unknown or unacknowledged.

Origin:

Mid 16th century (in the sense "namelessness, obscurity"): from anonymous + -ity.

Examples:

1. The witness was granted anonymity.
2. He preferred to publish his research under a pseudonym to maintain his anonymity.
3. Online anonymity can be both a blessing and a curse.
4. People are often more willing to share personal information online when they are granted anonymity.
5. The author published the book under a pseudonym to preserve his anonymity.