Definitions for userland
A conceptual space outside the kernel in which a user's applications can run without the risk of damage to the operating system.
The New Hacker's Dictionary
Anywhere outside the kernel. “That code belongs in userland.” This term has been in common use among Unix kernel hackers since at least 1985, and may have have originated in that community. The earliest sighting was reported from the usenet group net.unix-wizards.