Peer (noun)

1. A person of the same age, status, or ability as another.
2. A nobleman of the highest rank in Britain, a member of the House of Lords.
3. A person who is a member of a peer group.
4. A person who is considered an equal by others in a particular activity or profession.

Origin:

Middle english from old french pere meaning equal, companion.

Examples:

1. She has a lot of peers in her class who are just as smart as she is.
2. The Duke of Edinburgh is a peer of the realm.
3. Teenagers often look to their peers for validation and acceptance.
4. She is a peer of the best artists in the world.
5. He is respected by his peers as a knowledgeable expert in his field.