ra·​di·​ate | \ ˈrā-dē-ˌāt How to pronounce radiate (audio) \
radiated; radiating

Definition of radiate

 (Entry 1 of 2)

intransitive verb

1 : to proceed in a direct line from or toward a center
2 : to send out rays : shine brightly
3a : to issue in or as if in rays
b : to evolve by adaptive radiation

transitive verb

1 : to send out in or as if in rays
3 : to spread abroad or around as if from a center


ra·​di·​ate | \ ˈrā-dē-ət How to pronounce radiate (audio) , -ˌāt \

Definition of radiate (Entry 2 of 2)

: having rays or radial parts: such as
a : having ray flowers
b : characterized by radial symmetry : radially symmetrical

Other Words from radiate


radiately adverb

Synonyms & Antonyms for radiate

Synonyms: Verb

Antonyms: Verb

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Examples of radiate in a Sentence

Verb The pain was radiating down my arm. The sun radiates heat and light. Heat radiates from the sun.
Recent Examples on the Web: Verb These temperatures are especially dangerous in cityscapes, where a lack of green spaces, and concrete structures which absorb and radiate the sunlight, can make the city even hotter. Kasha Patel, Washington Post, 19 July 2022 Because the acting is so strong, especially from Henry and Matthews — both of whom radiate intensity, the former in shimmering forgiveness, the latter in rancid resentment — the family misfortunes seem, moment by moment, to add up. David Benedict, Variety, 26 June 2022 This policy shift will radiate from Berlin to other European capitals. Ariel Cohen, Forbes, 18 July 2022 The off-court shots, particularly the one of them laying on each other, radiate the joyful, sisterly bond Lyons witnessed. Patrick Sauer, Smithsonian Magazine, 22 Nov. 2021 That’s especially true for low-income residents, who also disproportionately live in heat islands — areas where abundant concrete and asphalt soak up the sun’s rays and radiate excess heat, driving up the cost of staying cool. Dharna Noor, BostonGlobe.com, 20 May 2022 The dark patina will actually absorb and radiate more heat than lighter shiny pans, which is ideal for roasting. Washington Post, 27 Sep. 2021 Little Miner’s success is not a momentary starburst, a happy accident based on some curious collision of pandemic ennui, culinary fad and cultural obsession for foods that ooze, drip and radiate their charisma across our social channels. Washington Post, 16 Nov. 2021 Although the olfactory bulb isn’t involved in cognitive functions, tenOever said, inflammation there can radiate deeper into the brain. Jason Mast, STAT, 13 June 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radiate.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of radiate


circa 1619, in the meaning defined at intransitive sense 1


1668, in the meaning defined above

History and Etymology for radiate


Latin radiatus, past participle of radiare, from radius ray

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Time Traveler for radiate

Time Traveler

The first known use of radiate was circa 1619

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Dictionary Entries Near radiate

radiant yellow



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Statistics for radiate

Last Updated

3 Aug 2022

Cite this Entry

“Radiate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radiate. Accessed 8 Aug. 2022.

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More Definitions for radiate


ra·​di·​ate | \ ˈrā-dē-ˌāt How to pronounce radiate (audio) \
radiated; radiating

Kids Definition of radiate

1 : to send out rays : shine The sun was radiating in the sky.
2 : to come forth in the form of rays Light radiates from shining bodies.
3 : to go out in a direct line from a center Spokes radiate from the center of the wheel.
4 : to spread around from or as if from a center Word radiated that Royce McNabb had sent Ina-Rae Gage a valentine.— Richard Peck, A Year Down Yonder
5 : to show very clearly She radiates confidence.


ra·​di·​ate | \ ˈrād-ē-ˌāt How to pronounce radiate (audio) \
radiated; radiating

Medical Definition of radiate

 (Entry 1 of 2)

intransitive verb

: to issue in or as if in rays : spread from a central point back pain radiating to both upper legs— Tony Miksanek


ra·​di·​ate | \ ˈrād-ē-ət, -ē-ˌāt How to pronounce radiate (audio) \

Medical Definition of radiate (Entry 2 of 2)

1 : having rays or radial parts
2 : characterized by radial symmetry : radially symmetrical

More from Merriam-Webster on radiate

Nglish: Translation of radiate for Spanish Speakers

Britannica English: Translation of radiate for Arabic Speakers


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