Definition of "rainbow" []

• An arc of spectral colors, usually identified as red, orange, yellow, green, blue, indigo, and violet, that appears in the sky opposite the sun as a result of the refractive dispersion of sunlight in drops of rain or mist. (noun)
• A similar arc or band, as one produced by a prism or by iridescence. (noun)
• A graded display of colors. (noun)
• An illusory hope: chasing the rainbow of overnight success. (noun)
• A diverse assortment or collection. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Heritage Week or Day, established in recognition of the term rainbow nation, coined by former president Mandela in 1996, came to an end in pomp and fashion on Friday night and the hundreds that came over the week witnessed culture blend with the modern world in colour, sound and taste."
• "All late morning and early afternoon long, Ernie puts on his cheerful song and dance routine while carefully layering the ingredients on fresh-baked buns in what he calls the rainbow effect -- a special order as to what ingredients goes on from first to last."
• "Everybody know about little children all seem to be fascinated by rainbows because the rainbow is the unique phenomena for children, they always seem happy if they see rainbow."