adverb, time word, directional, adjective, noun, verb, measure word, idiom, suffix, punctuation, particle · to the highest degree; (the) most; used before an adjective or verb to indicate a superlative (-est)

他是我们班最高的学生。

noun · the best or most extreme example, typically used after 之 zhī (zhī)

这项工程创造了多项世界之最。