1. <file system> pathname.
2. <networking> A bang path or explicitly routed Internet address; a node-by-node specification of a link between two machines.
3. <operating system> The list of directories the kernel (under Unix) or the command interpreter (under MS-DOS) searches for executables. It is stored as part of the environment in both operating systems.
Other, similar constructs abound under Unix; the C preprocessor, for example, uses such a search path to locate "#include" files.