- 1showing great happiness, love, or health a radiant smile The bride looked radiant. radiant with something She was radiant with health.
- 2giving a warm bright light The sun was radiant in a clear blue sky.
- 3[only before noun] (technology) sent out in rays from a central point the radiant heat/energy of the sun
adverb radiantly happy He smiled radiantly.See radiant in the Oxford Advanced Learner's Dictionary
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