Defining in quote marks because any definition is going to have to be vague, unfortunately. It's obvious that demons have some sort of inherent definition, or at least have to have a definition, because otherwise nobody would be able to pick them out of the crowd in the research to pin down what you identify as. What that definition is, however, is by no means easy to explain and encompasses such a wide variety of beings that no highly specific definition could cover everything. What I'm looking to discuss, however, is coming up with a general definition of what type of beings fall under the category of demon, and other aspects that are generally part of the "demonic" world that can be brought up in a definition. Google defines demon this way: De-mon [/ˈdēmən/], n. 1. an evil spirit or devil, especially one thought to possess a person or act as a tormentor in hell. 2. reckless mischief; devilry. [this is a weird case of a noun being used as an adjective] These are the two official definitions I find most relevant, ignoring the application of the word to particularly cruel humans or those who are wickedly skilled, pun intended. An obligatory mention here is also the original Greek term daimon or daemon, referring to, according to Google, "a divinity or supernatural being of a nature between gods and humans, an inner or attendant spirit or inspiring force" as well as an archaic spelling of demon. Google's definition is a pretty solid, general definition, and in my opinion fairly good to use for our purposes. It doesn't restrict it to any one faith system, only lists some of the more well-known or common applications of the term. Wikipedia offers the following definition (and again addresses the difference between the original daimon and the modern demon): 3. A supernatural, often malevolent being prevalent in religion, occultism, literature, fiction, mythology and folklore. as well as some further specifics: -In Ancient Near Eastern religions as well as Abrahamic traditions [...] a demon is considered to be an unclean spirit, fallen angel, or a spirit of unknown type which may cause demonic possession -In Western occultism and Renaissance magic [...] a demon is believed to be a spiritual entity that may be conjured and controlled. -According to the Britannica Concise Encyclopedia, demons, despite being typically associated with evil, are often shown to be under divine control [this note comes after an example of gods commanding demons], and not acting of their own devices. [and here we get into Lucifer's gripe about free will *insert grumpy face of kinself* ] Thoughts? Additional definitions?