Understudy definition, to learn (a role) in order to replace the regular actor or actress when necessary. See more.
Radiation. radiation. (Science: radiobiology) propagation of energy through space. In the context of this report, it is electromagnetic radiation (x-rays or gamma rays) or corpuscular radiation (alpha particles, electrons, protons, neutrons) capable of producing ionisation.adiation. radiation. (Science: radiobiology) propagation of energy through space. In the context of this report, it is electromagnetic radiation (x-rays or gamma rays) or corpuscular radiation (alpha particles, electrons, protons, neutrons) capable of producing ionisation.
Primary Meanings of radiation. 1  n the act of spreading outward from a central source. 2  n a radial arrangement of nerve fibers connecting different parts of the brain. 3  n the spread of a group of organisms into new habitats. 4  n energy that is radiated or transmitted in the form of rays or waves or particles.