Meaning of “superlative” - Learner’s Dictionary

superlative

noun [ C ] uk us /suːˈpɜːlətɪv/

A2 the form of an adjective or adverb that is used to show that someone or something has more of a particular quality than anyone or anything else. For example 'best' is the superlative of 'good' and 'slowest' is the superlative of 'slow'.

→ Compare comparative noun

(Definition of “superlative” from the Cambridge Learner’s Dictionary © Cambridge University Press)