The article analyzes the definitional status of the lexical unit "training" within the Russian education system. The authors examine the problem of terminological ambiguity arising from the absence of a clear legislative definition for this concept in the Federal Law "On Education in the Russian Federation." The semantic instability of the lexical unit (denoting both the process and the result) is transferred from professional discourse into the legal domain thus causing systematic logical conflicts within the law. Through analysis of key articles the study demonstrates how the inconsistent use of the concepts "student training," "quality of education," "educational activities," and "quality of training" complicates systematic legal regulation. The research includes comparative analysis of lexicographic sources, legal provisions, and theoretical works. It concludes that there is a necessity for the legislative consolidation of a consistent definition of the lexical unit "training" in order to eliminate legal uncertainty and ensure the correct application of norms in by-laws and local regulatory documents.