noun Technical meaning of hp-ux (operating system) The version of Unix running on Hewlett-Packard workstations. HP-UX conforms to X/Open's Portability Guide Issue 4 (XPG4), Federal Information Processing Specification (FIPS) 151.1, POSIX 1003.1, POSIX 1003.2, AT&T's System V Interface Definition 2 (SVID 2). HP-UX incorporates selected features from the University of California at Berkeley Software Distribution 4.3 (4.3BSD). It is known by some as "HP-SUX". 1
