Said the first dig electricity to the philosophical background of the study of meaning, especially meaning of the word, then to the early work of treating the dictionary as a text, the first serious efforts at extracting information from machine readable dictionaries (MRDs), and conversion can be used MRDs into base lexical knowledge. The author gives a comparative survey of worldwide working on the excavation of the structure can be used from the dictionaries for computational-linguistic purposes and a discussion of how these structures differ from or interact with structures derived from standard texts (or corpora). Also discussed is the automatic techniques for analyzing MRDs, genus hierarchies and networks, numerical methods of language processing related to dictionaries, automatic processing of bilingual dictionaries, and consumer projects using MRDs.