Hear of Definition 1 of 3Pro Tip 1/3General Awareness Used when someone might know about a person or thing, but not in detail. Jenny might have heard of quantum physics, but she can't explain it. Pro Tip 2/3Cultural Knowledge Often used to reference popular culture or current events. Have you heard of the latest diet trend? Pro Tip 3/3Indirect Experience Implies knowledge without personal experience or encounter. She's heard of the author, but never read her books.