The publication of the English-Khmer and Khmer-English Dictionary of Economics and Social Terminology has been done in hard copy for many times and many years. To be fit with the context of Industrial Revolution 4.0, we need to re-do it in digital manner. The online dictionary is very popular in the world today, more and more people have tendency to read on smart phone, Tablet, computer or other electronic devices. This is the latest version of the Dictionary prepared in App for the smart phon