As always there is a big difference in the original concept (in Judaism) and with the new concept (christiantiy).
Satan Look up Satan at Dictionary.com
proper name of the supreme evil spirit in Christianity, O.E. Satan, from L.L. Satan (in Vulgate, in O.T. only), from Gk. Satanas, from Heb. satan "adversary, one who plots against another," from satan "to show enmity to, oppose, plot against," from root s-t-n "one who opposes, obstructs, or acts as an adversary." In Septuagint (Gk.) usually translated as diabolos "slanderer," lit. "one who throws (something) across" the path of another (see devil), though epiboulos "plotter" is used once.
"In biblical sources the Hebrew term the satan describes an adversarial role. It is not the name of a particular character. Although Hebrew storytellers as early as the sixth century B.C.E. occasionally introduced a supernatural character whom they called the satan, what they meant was any one of the angels sent by God for the specific purpose of blocking or obstructing human activity." [Elaine Pagels, "The Origin of Satan," 1995]
Satanic "pertaining to Satan" is first recorded 1667 (in "Paradise Lost"); meaning "diabolical" is from 1793. Satanism "worship of Satan" dates from 1896, with ref. to France, where it was said to be active at that time; Satanist is attested from 1559, applied by their enemies to Protestant sects.
http://www.jewishencyclopedia.com/view.jsp?artid=270&letter=S
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