So, alot of people have heard the term necromancy. Some have deemed it evil, some have thought it neutral, and some believe in it's practice with religious zeal. But one question remains, what really is necromancy?

Under the old terminology, necromancy is the calling of the dead for wisdom or of receiving wisdom from the dead. Usually this wisdom has to do with events of the future, but there have been linkings to the asking of past events, ect.
Nowandays, there are some who define necromancy by different terms:
-The summoning of the dead for gaining something (generally a material goal ex: women, money, a car, power)
-The calling forth and commanding of "death energies."
-The summoning of infernal forces to do ones bidding
-the forceful chaining of dead spirits
-the alignment with the angel of death, Azrael
(note- there is probably a dozen more, so go ahead and put them down yourself if you wish.)

A good site that lists off its own type of "modern" necromancy:
http://www23.brinkster.com/falcis/

So, do you agree and, if so or if not, which one do you agree with most/least?
How do you define necromancy?