The Free On-line Dictionary of Computing (30 December 2018):

pathname
pathspec

    (Or "path") The specification of a node (file or
   directory) in a hierarchical file system.  The path is usually
   specified by listing the nodes top-down, separating the
   directories by the pathname separator ("/" in Unix, "\" in
   MS-DOS).

   A pathname may be an absolute pathname (starting from the root
   directory, "/") or a relative pathname (starting from the
   current working directory).

   The part of the pathname of a file after the last separator is
   called the basename.

   (1997-03-10)