adj

• (literally) Having the power to carry something or someone above, over or beyond others.
• (figuratively) Exceptionally good; of the highest quality.
  "The Governor-General was entertaining at a civil banquet in the evening. He is reported as having made a “superlative speech, congratulating the Victorians on their loyalty; […].”"
• (grammar) Of or relating to the superlative degree (a degree of comparison of adjectives and adverbs).

noun

• (grammar) The degree of comparison of an adjective or adverb used when comparing three or more entities in terms of a certain property or a certain way of doing something. In English, the superlative of superiority is formed by adding the suffix -est or the word most (e.g. tiniest, most fully); the superlative of inferiority, by adding the word least (e.g. least big, least fully).
• (grammar) An adjective or adverb in the superlative degree.
  "Daniel is amazing, wonderful, fantastic, and many other superlatives I can’t think of right now!"