Meta- (from Greek: μετά = "after", "beyond", "with", "adjacent", "self"), is a prefix used in English to indicate a concept which is an abstraction from another concept, used to complete or add to the latter. 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… (More on Meta-level)