"Functioning Language Units in Synchronicity and Diachrony: A Collection of Scientific Papers. Issue. 3" is a unique and in-depth collection of studies that immerses the reader in the complex and fascinating world of linguistics, revealing the mysteries of the functioning of language units over time and in various contexts. The author’s team, consisting of leading scientists and specialists in the field of theoretical and applied linguistics, created this collection for those who seek to understand the mechanisms of language development, its structural features and dynamics of changes. This book is a real treasure for professional linguists, teachers, graduate students and students interested in modern theories of the language and its history. It is also suitable for those who are looking for a scientific justification for their research or simply want to expand their knowledge of how language units - words, morphemes, syntactic structures - function in different eras and in different communicative situations. At the age of 18 and older, readers with a basic knowledge of linguistics will find many new ideas, theoretical approaches, and practical examples in this book. The peculiarity of the collection lies in its interdisciplinary approach, combining synchronous and diachronic research. It addresses issues related to changes in language units under the influence of historical, social and cultural factors, as well as their functioning in modern language. The reader will be able to trace how the evolution of language affects the structure of words, their meanings and their use in speech. The book raises current topics such as linguistic variability, processes of linguistic standardization and differentiation, and the role of linguistic units in intercultural communication. Particular attention is paid to the methodological aspects of the study of language changes, which makes the book a valuable tool for those who are engaged in scientific work or plan to delve into the theory of language development. The author's team uses modern methods of analysis, which allows not only to understand the theoretical foundations, but also to see the practical application of the knowledge gained. The collection presents both classical research and recent scientific articles, which makes it relevant and saturated with new discoveries. The style of the author is a combination of scientific rigor and live, accessible presentation, which allows even an unprepared reader to feel a complex topic and enjoy reading. In the book you can find many examples from different languages and eras, which makes it not only a textbook, but also a fascinating guide to the world of language evolution. Overall, "Functioning Language Units in Synchronicity and Diachrony: A Collection of Scientific Papers. Issue. 3" is an important event in the field of modern linguistics, which deserves the attention of everyone who is interested in the history of the language, its structure and development. If you are looking for a book that will help you understand how language lives and changes, and why it remains one of the most amazing human achievements, then this publication will be a real discovery for you. It will not only expand your horizons, but also inspire new research and reflection on the nature of human communication. In the world of linguistics, this book occupies a worthy place, being an important contribution to the development of the theory and practice of language learning.