The "Philosophical Lexicon" application is a free educational application for personal use, and it is an application that was programmed for personal benefit on a personal initiative, with the aim of researching philosophical concepts and their definitions for use in purely educational purposes.The application is based on a database of philosophical concepts with a search box that enables the user to have different characteristics that are determined in:Review concepts successively without searching, selecting them, and obtaining their definitionsUse the search box to be able to review the basic philosophical concepts or concepts related to themThe user can keep the favorite concepts by left clicking on the save icon and can remove the preference from the same iconWhen saving any of the concepts, the user can click on the preferences library at the top of the application on the left to return to it every time, and he can also remove the preferences from itThe user can select the desired text within the definitions of concepts and copy it to be used for educational purposesThe application has a night mode and a normal mode to facilitate reading as desired by the userThrough the "About the Application" icon, the user can evaluate the application or visit the applications website, which provides other possibilities for research.