Superlative form of bright: most bright.(adjective)
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Use "brightest" in a sentence
"How to compensate our best and our brightest is a tricky subject."
"HATFIELD: The materials are what we call brightest (ph) cloth, which is a curtain material, plastic-like material that's used for temporary ventilation structures."
"Lord Chatham returned to England, where he distinguished himself greatly in the debates on the American war, which he called the brightest jewel of the British crown."