EAVerhältnis

Could you specify what "EAVerhältnis" refers to? The term is not widely established on its own and could denote different things in different contexts. For example, it might be used as a technical term in economics or statistics, as a legal or employment-related concept, or as a proper noun (such as a band, project, or publication). If you indicate the intended domain and the desired scope (a brief stub or a full article), I can generate a neutral, concise wiki-style entry under 300 words.