noun, noun which may take the genitive case particle 'no'
largest class; top category
Used to describe something as being among the largest, greatest, or most extreme in its category. Often appears in news, reviews, and formal descriptions.
この台風は過去最大級の勢力を持っている。
This typhoon has the largest class of strength on record.
彼は世界
He owns one of the world's largest collections.