superlative (adj.)

late 14c., from Old French superlatif "absolute, highest; powerful; best" (13c.) and directly from Late Latin superlativus "extravagant, exaggerated, hyperbolic," from Latin superlatus "exaggerated" (used as past participle of superferre "carry over or beyond"), from super "beyond" (see super-) + lat- "carry," from *tlat-, past participle stem of tollere "to take away" (see extol). Related: Superlatively; superlativeness.

The noun is attested from 1520s, originally in the grammatical sense, "a word in the superlative;" hence "exaggerated language" (1590s).

Definitions of superlative
superlative (n.)
an exaggerated expression (usually of praise);
the critics lavished superlatives on it
superlative (n.)
the highest level or degree attainable; the highest stage of development;
so many highest superlatives achieved by man
Synonyms: acme / height / elevation / peak / pinnacle / summit / meridian / tiptop / top
superlative (n.)
the superlative form of an adjective or adverb;
`most surely' is the superlative of the adverb `surely'
`least famous' is the superlative degree of the adjective `famous'
`fastest' is the superlative of the adjective `fast'
Synonyms: superlative degree
superlative (adj.)
highest in quality;
Synonyms: greatest / sterling