A possibly nonhuman form emitting influence on people, like a corporation or a religious institution - things that you can't quite pat on the head but they're having an influence regardless of whether they are materially present or physically describable. A body of semiotics. Sun gods, like superman. Corporations. A relation of networks.
Wikipedia describes egregore as "a "thoughtform" or "collective group mind", an autonomous psychic entity made up of, and influencing, the thoughts of a group of people. The symbiotic relationship between an egregore and its group has been compared to the more recent, non-occult concepts of the corporation (as a legal entity) and the meme".
- Discussion with @mathpunk on 8 Aug 2012.