an ability to understand the meaning or importance of something (or the knowledge acquired as a result); "how you can do that is beyond my comprehension"; "he was famous for his comprehension of American literature"
the process of ionizing; the formation of ions by separating atoms or molecules or radicals or by adding or subtracting electrons from atoms by strong electric fields in a gas
the condition of being dissociated into ions (as by heat or radiation or chemical reaction or electrical discharge); "the ionization of a gas"