English: object whose space of existence is the mind; item that is thought of as being "in" the mind, and capable of being formed and manipulated by mental processes and faculties: thoughts, concepts, memories, emotions, percepts and intentions
Japanese: 精神に存在する対象。精神の「中に」あると考えられ，精神的過程・能力によって形成・操作できる項目。思考・概念・記憶・感情・知覚・意図