Definition of superlation in US English:

superlation

noun

rare
  • Exaggeration, hyperbole, aggrandizement; an instance of this.

Origin

Mid 17th century; earliest use found in Ben Jonson (?1573–1637), poet and playwright. From classical Latin superlātiōn-, superlātiō intensification, raising to a higher degree, (in rhetoric) exaggeration, hyperbole, (in grammar) raising of an adjective to the superlative degree from superlāt- + -iō.