[ra.di.a.tion] n (15c) 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
4: adaptive radiation
5: radiator -- ra.di.a.tion.al adj -- ra.di.a.tion.less adj -- ra.di.a.tive adj