1. particles emitted by radioactive substances: energy emitted in the form of particles by substances such as uranium and plutonium, whose atoms are not stable and are spontaneously decaying. This energy can be converted into electric power, but it can also cause severe or fatal health problems to people who are exposed to it.
2. physics energy emitted in rays or waves: energy emitted from a source in the form of rays or waves, e.g. heat, light, or sound
3. physics radiating of energy: the emission of energy in the form of rays or waves
4. effect of radiating: the feeling of something being radiated, e.g. heat from a hot oven
