What is the definition of Hell?

The word "hell" is found in many Bible translations. In the same verses other translations read "the grave," "the world of the dead," and so forth. Other Bibles simply transliterate the original-language words that are sometimes rendered "hell"; that is, they express them with the letters of our alphabet but leave the words untranslated. What are those words? The Hebrew she'ohl´ and its Greek equivalent hai´des, which refer, not to an individual burial place, but to the common grave of dead mankind; also the Greek ge´en·na, which is used as a symbol of eternal destruction.

Despite this, both in Christendom and in many non-Christian religions it is taught that hell is a place inhabited by demons and where the wicked, after death, are punished (and some believe that this is with torment).