Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term phenomenology in science is used to describe a body of knowledge which relates empirical observations of phenomena to each other, in a way which is consistent with fundamental theory, but is not directly derived from theory. For example, we find the following definition in the Concise Dictionary of Physics: Phenomenological Theory. A theory which expresses mathematically the results of observed phenomena without paying detailed attention to their fundamental significance. The name is derived from phenomenon (from Greek o , pl. - phenomena) which is any occurrence that is observable.