The process of globalization in modern world has affected all spheres of our life – politics, economy and culture. To realize these processes people should have a common means of communication – a lingua franca. The English language has become this lingua franca, as about 1, 5 billion people speak English today. People of different cultural, ethnic and religious identities should have more to share than ever before. And one of the means of their crosscultural communication in many parts of the world today is the English language. People today communicate beyond national borders by e-mailing, chatting, blogging besides speaking and writing. Global networking has produced new societies of hybrid and very often conflicting cultures, where people are to become pluricultural individuals. The article deals with the problems of national language variety definition in general and special lexicography. The definition of the term “national language” is given; its subcategories, such as “dialect”, “form”, “variety”, and “variant” are analyzed, and the ways of the national language formation and changes are described.