Terms such as kusu (well-cured sake) or vintage sake are not defined, and all sake that were brewed beyond the Jozonendo are called 'kusu' in brewery lingo.
古酒や大古酒といった語の定義は統一されていないようであるが、蔵人言葉では醸造年度を越したものはすべて「古酒」と呼ぶ。