noun

1. an arc or ring containing the colors of the spectrum in consecutive bands, formed in the sky by the refraction, reflection, and dispersion of light in rain or fog
2. a multicolored array or assortment
3. a wide range or selection

Etymology: ME reinbowe < OE regnboga: see rain & bow

adjective

1. of many colors
2. 1. of or involving the collaboration of members of diverse groups, esp. racial or minority groups a rainbow commission to study housing
   2. designating a political coalition of diverse racial or minority groups