VOCABULARY WITH THE ETYMOLOGIC ROOT *SЬRD- INCLUDED IN THE MICROFIELD «INTERVAL» IN THE HISTORY OF THE RUSSIAN LANGUAGE

The article describes the vocabulary with the etymological root *sürd-, which is part of the micro field «interval». The main meanings that are expressed as a single rooted tokens and composites in the history of the Russian language are identified. It is noted that some linguistic units found syncretic meanings and belong to multiple semantic micro fields, for example, «interval» and «center», «interval» and «mediation». In diachrony words that had meaning in their semantic invariant «interval», pointed out the sign of the average in size, characteristics, qualities; they called the object, which was located in the middle of something (country, countryside, rivers, etc.) or that was the average period of life, history,
development, etc.; denoted the average of any quantities.