The 'truth', the term so much exploited by Heidegger, belongs to the one of epistemological theories, the truth theory, which is the traditional part of the epistemological theory of knowledge. Six theories on truth are known in the history of philosophy (the theory of correspondence with its subkind the semantical theory, the revelation theory, the theory of the rules of submit, the coherence theory, and the pragmatic one). Each of them successfully described one of the many aspects of the truth, i.e. of the scientific notion of the truth to which empirical rather than metaphysical approach was relevant. It is important to give attention to the new epistemological theories of knowledge, especially semantic ones, as well as to the conceptions of the proof, and the theories of justification, nowadays discussed within the modern epistemology. It is clear that the truth in the science is a temporal term, closely connected to the level of the development of the science, the competences of a researchers and their research environment.
