radiation
noun
ra·di·a·tion
ˌrā-dē-ˈā-shən 
1
a
: the action or process of radiating
b
: the process of emitting radiant energy in the form of waves or particles
c(1)
: the combined processes of emission, transmission, and absorption of radiant energy
(2)
: the transfer of heat by radiation compare conduction, convection
2
a
: something that is radiated
b
: energy radiated in the form of waves or particles
3
: radial arrangement
Examples of radiation in a Sentence
She was exposed to high levels of radiation.
He goes in for radiation next week.
the sun's radiation of heat
Recent Examples on the Web
In other words, the length of telomeres indicates how quickly someone may be aging.
Stressors associated with microgravity, radiation, diet, exercise, and even loneliness have all been shown to induce aging in astronauts.
—
Discover Magazine, 18 Apr. 2025
Rare earth concentrations also tend to happen alongside uranium – a geophysical reality that has led to radiation concerns at many mines, says Raquel Dominguez, circular economy policy advocate at the environmental group Earthworks.
—Stephanie Hanes, Christian Science Monitor, 18 Apr. 2025
The radiation can only be lowered to a point, though.
—Emily Kay Votruba, EverydayHealth.com, 17 Apr. 2025
To curtail radiation exposure, authors of the study and the editorial urge changes to current practices.
—Ronnie Cohen, NPR, 16 Apr. 2025
See All Example Sentences for radiation
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Discover Magazine, 18 Apr. 2025
Rare earth concentrations also tend to happen alongside uranium – a geophysical reality that has led to radiation concerns at many mines, says Raquel Dominguez, circular economy policy advocate at the environmental group Earthworks.
—Stephanie Hanes, Christian Science Monitor, 18 Apr. 2025
The radiation can only be lowered to a point, though.
—Emily Kay Votruba, EverydayHealth.com, 17 Apr. 2025
To curtail radiation exposure, authors of the study and the editorial urge changes to current practices.
—Ronnie Cohen, NPR, 16 Apr. 2025
See All Example Sentences for radiation
Cite this Entry
“Radiation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radiation. Accessed 22 Apr. 2025.
Copy CitationKids Definition
radiation
noun
ra·di·a·tion
ˌrād-ē-ˈā-shən
1
: the action or process of radiating
especially
: the process of giving off radiant energy in the form of waves or particles
2
: something that is radiated
especially
: energy radiated in the form of waves or particles
Medical Definition
radiation
noun
ra·di·a·tion
ˌrād-ē-ˈā-shən
1
: energy radiated in the form of waves or particles
2
3
: a tract of nerve fibers within the brain
especially
: one concerned with the distribution of impulses arising from sensory stimuli to the relevant coordinating centers and nuclei
the optic radiations
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