What is the opposite of Relative key?

The opposite of Relative key includes: Parallel key.

Relative key

A major and minor key that share the same key signature but have different tonics.

About Relative key

Every major keyKeyThe tonal centre that organises a piece of music around a specific note and scale.View full entry → has a relative minor, and every minor key has a relative major — the two keys share exactly the same set of seven diatonicDiatonicPertaining to the seven notes of a major or natural minor scale without chromatic alteration.View full entry → pitches but centre on different tonicTonicThe first and most important note of a key, serving as the central point of rest and resolution.View full entry → notes. The relative minor of any major key is found by going to its sixth scaleScaleAn ordered series of pitches ascending or descending by step.View full entry → degree: C major's relative minor is A minor, both using only white keys.