(1) A general term for both audio categories and meaning/object categories. Some translators render the term as "universal" or "generality." (2) A set to which individual items sharing a common defining characteristic belong. It is mentally constructed (mentally fabricated) by a mental synthesis of individual items that are instances of it, or by a mental synthesis of the spatial, sensorial, and/or temporal parts on which it is imputed (labeled). Sometimes translated as "mental synthesis" or just "synthesis."
J Hopkins: generality; general; all; universal.