sacred
     adj 1: concerned with religion or religious purposes; "sacred
            texts"; "sacred rites"; "sacred music" [ant: {profane}]
     2: worthy of respect or dedication; "saw motherhood as woman's
        sacred calling"
     3: made or declared or believed to be holy; devoted to a deity
        or some religious ceremony or use; "a consecrated chursh";
        "the sacred mosque"; "sacred elephants"; "sacred bread and
        wine"; "sanctified wine" [syn: {consecrated}, {sanctified}]
     4: worthy of religious veneration; "the sacred name of Jesus";
        "Jerusalem's hallowed soil" [syn: {hallowed}]
     5: (often followed by `to') devoted exclusively to a single use
        or purpose or person; "a fund sacred to charity"; "a
        morning hour sacred to study"; "a private office sacred to
        the President"
Source: WordNet® 2.0

sacred adj. Reserved for the exclusive use of something (an extension
   of the standard meaning). Often means that anyone may look at the sacred
   object, but clobbering it will screw whatever it is sacred to. The
   comment "Register 7 is sacred to the interrupt handler" appearing in a
   program would be interpreted by a hacker to mean that if any _other_
   part of the program changes the contents of register 7, dire
   consequences are likely to ensue.


Source: The Jargon File