radiation
//ˌreɪdiˈeɪʃən//
Noun
radiationSingular
radiationsPlural
1
The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.
Exposure to high levels of radiation can be harmful to human health.
2
The energy transmitted in the form of rays, waves, or particles.
The sun emits radiation in the form of light and heat.
3
The process of radiating or spreading outward from a central point.
The radiation of heat from the fireplace warmed the entire room.
4
Medical treatment using radioactive substances or X-rays to destroy diseased tissue.
The doctor recommended radiation to treat the tumor.