rainbow: Meaning and Definition of

rain•bow

1. a bow or arc of prismatic colors appearing in the heavens opposite the sun and caused by the refraction and reflection of the sun's rays in drops of rain. Cf.
2. a similar bow of colors, esp. one appearing in the spray of a waterfall or fountain.
3. any brightly multicolored arrangement or display.
4. a wide variety or range; gamut.
5. a visionary goal: He pursued the rainbow of a singing career for years before becoming a success.
6. See

1. made up of diverse races, ethnic groups, etc.: a rainbow coalition of supporters.