Definition: Debian 5.0 refers to a release version, starting in 2007, while 64-bit refers to Debian being compatible with an x86-64 architecture. Detailed definitions include: 1. Debian: A large, open-source software distribution originally released by the Debian Project. 2. 5.0: The first Debian release, which was introduced on January 9, 2007. 3. 64-bit: An operating system that runs on a computer with at least one Intel Core i5 processor (the "Core" is not an exact match but the core of an Intel CPU), or more specifically, a machine running Linux. Debian 5.0 was the first Debian version to be compatible with x86-64 architectures and was released in February 2007.