"The Dictionary of Mathematics" presents the most modern concepts of Mathematics in alphabetical order. The terms selected are presented in brief analytical phrases duly supported by line diagrams of structures wherever necessary. This dictionary is a pioneering attempt to provide simple and lucid exposition of the basic concepts, prìnciple and theories in the most modern usage. A very systematic and scientific analysis of each entry should prove highly relevant and functional, informative and comprehensible to the reader at every stage. The purpose of this publication is to make easy understanding of the Mathematics words which one comes across in day-to-day life and with the aid of this publication such words can be appreciated and understood in a far better way. Dictionary of Mathematics is a unique presentation of words to be used by the school and college students, teachers and researchers in this field. This dictionary has been complied and prepared after consulting various dictionaries available in the market. We have tried out best to present before you the updated forms of words being used in Mathematics. The modern approach to information technology has been taken into account in the presentation of different types of words frequently used in modern perspective. It is clear from the pronunciation of word and syllable, which has the student of mathematics usage. All words have been presented with specific marks so as to make them familiar in their entirety. Accessible yet rigorous, concise but comprehensive, Dictionary of Mathematics, is your key to accuracy in writing or understanding scientific, engineering, and mathematical literature.