You searched for: “contraposition
contraposition (s) (noun), contrapositions (pl)
1. Placing over against or in an opposite position: Christopher, the composer, wrote some music for the bassoon to be in contraposition to the part for the flute.
2. An opposition, a contrast, or antithesis: Attorney Younge's argument for the ongoing imprisonment of the youth was in contraposition to that of the judge in the court.