rainbowism

(chiefly, US, rare) Made up of several races or ethnicities; rainbow.

(often used with “of”) A wide assortment; a varied multitude.

Resembling, involving or illuminated with a rainbow; patterned with the colours of the rainbow.

(British, Ireland, politics) A government consisting of a coalition of three or more parties, particularly parties with divergent ideologies.

Any prismatic refraction of light showing a spectrum of colours.