It includes the terms of twenty-one sciences, and its compiler meant to define these terms in a way that ranges from length and shortness, and sometimes it is mentioned more than a definition as it stands from the sayings of scholars who specialize in every science and art, and the idea inherent in its classification was like others- that knowing these terms is keys to science that the learner enters In the field of science that seeks it and that whoever absorbs the terms of science and realizes the semantic differences between the places of scholars, it is easy for him to understand their purposes, and its ambiguity is not a stone that found it standing between it and the reading of their books until it becomes a striking in that science with a share and then we were keen to present this book.
