Acatalepsy is a philosophical concept meaning something cannot be completely understood or known. It's like if you asked a five year old to explain how a computer works. Even though they might understand that it is used to type, search the internet, or play games, they wouldn't be able to explain the complex parts of the computer that make it work. In the same way, acatalepsy suggests that we can never really understand or know everything about something, no matter how hard we try.