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radiate has 7 distinct synonyms spread across 5 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
send out rays or waves
“The sun radiates heat”
send out real or metaphoric rays
“She radiates happiness”
cause to be seen by emitting light as if in rays
“The sun is radiating”
issue or emerge in rays or waves
“Heat radiated from the metal box”
1 of the 10 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for radiate.
Synonyms, antonyms and the broader and narrower relations for radiate come from Princeton University’s WordNet. Full sources and licences.