noun, noun which may take the genitive case particle 'no'
Used as a noun or adjectivally with の to describe something that looks back on the past, such as an exhibition, collection, or analysis.
この美術館でピカソのレトロスペクティブが開催されている。
A Picasso retrospective is being held at this museum.
レトロスペクティブな視点から問
Analyze the problem from a retrospective perspective.