Sredniy
Sredniy is the transliteration of the Russian adjective средний, which generally means middle, central, or average. It is used to describe position in a sequence, size, level, or quality, and it appears in a wide range of ordinary phrases such as средний размер (middle/medium size), средний возраст (middle age), and средний уровень образования (average level of education). In mathematics and statistics, the related noun среднее denotes the mean or average value.
Grammatical forms of sredniy follow standard Russian adjective inflection. The masculine form is sredniy, the feminine
Etymology traces sredniy to the Slavic root related to sred- or sered-, meaning middle or center, connected
In geography and toponymy, sredniy is sometimes used to denote central or middle parts of larger regions.