dopolnitelny
Dopolnitelny is a transliteration of the Russian adjective дополнительный, meaning additional, supplementary, or extra. It describes something that is not part of the core or essential set but is added to enhance, complete, or support it. The term is widely used across contexts to denote optional or incremental elements.
Etymology and grammar: дополнительный derives from the noun дополнение (an addition, supplement) and the verb дополнять (to supplement, to
Usage and contexts: In education, it refers to after-class or remedial work, often called дополнительные занятия. In commerce
Nuance and related terms: The antonym of дополnительный is основной (main, primary). Dopolnitelny can also express optionality