Who | Mean of who in English Dictionary

/ˈhuː/

• what or which person or people
1. Who will be the next president?
2. Who is standing next to you in this photo?
3. I didn't know who he was.
4. Find out who they are.
5. I wonder who else signed up.
6. Who should walk in [=who do you think walked in] when we least expected it? My parents!
7. She isn't sure who she talked to.
• information about the people who make up a group
1. We had lived in this town long enough to know who was who. [=to know the names of the different people, what they did, etc.]
2. I'm still learning who's who around the office.
• a list of the names of the important and well-known people in a particular field
1. The guest list reads like a who's who of the publishing industry.

• the important and well-known people in a particular field
1. The convention was attended by a who's who of the publishing industry.