This paper is focused on Cataloga, a software package based on Lexicon-Grammar theoretical and practical analytical framework and embedding a lingware module built on compressed terminological electronic dictionaries. We will here show how Cataloga can be used to achieve efficient data mining and information retrieval by means of lexical ontology associated to terminology-based automatic textual analysis. Also, we will show how accurate data compression is necessary to build efficient textual analysis software. Therefore, we will here discuss the creation and functioning of a software for semantic-based terminological data mining, in which a crucial role is played by Italian simple and compound-word electronic dictionaries. Lexicon-Gramma...