Deaf is an adjective that describes someone who is unable to hear or has very limited hearing ability.
In medical terms, deaf refers to a complete or partial inability to hear sounds.
The term "deaf" can also be used in these contexts:
1. Deaf community - a cultural group of people who share sign language and deaf culture
2. Deaf to something - idiom meaning deliberately ignoring something
3. Deafening - extremely loud noise that could cause hearing loss