superlative degree is a noun meaning "the superlative form of an adjective or adverb". It carries one recorded sense.
the superlative form of an adjective or adverb
“`fastest' is the superlative of the adjective `fast'”
“`least famous' is the superlative degree of the adjective `famous'”
“`most surely' is the superlative of the adverb `surely'”
Definitions, synonyms and semantic relations for superlative degree come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.