Meta (from Greek: ???? = "after", "beyond", "with"), is a prefix used in English in order to indicate a concept which is an abstraction from another concept, used to complete or add to the latter. The Greek meta is equivalent to the Latin post.In epistemology, the prefix meta- is used to mean about (its own category). For example, metadata are data about data (who has produced them, when, what format the data are in and so on). Similarly, metamemory in psychology means an individual's knowledge about whether or not they would remember something if they concentrated on recalling it. Furthermore, metaemotion in psychology means an individual's emotion about his/her own basic emotion, or somebody else's basic emotion..Another, slightly different interpretation of this term is "about" but not "on" (exactly its own category). For example, in linguistics a grammar is considered as a metalanguage, or a sort of language for describing another language (and not itself). A meta-answer is not a r
Source:
http://en.wikipedia.org/wiki/meta