L.A

                                                                   

                                 Radiation 

Radiation(noun) [rey-dee-ey-shuh n]: 1-the process in which energy is emitted as particles or waves.

2-the complete processes in which energy is emitted by on body, transmitted medium or space and absorb by another body. 

Latin radiātiō gleam.
the word radiation come from the the word parts radiate and -tion
radiate (verb):1-to send out rays or waves 
2-to spread into new habitats and thereby diverge or diversify.