Definitions

1. noun

the process of changing a substance into ions by the addition or removal of electrons

“The high-energy radiation caused ionization in the air, leading to the formation of sparks.”

2. noun

the state of being ionized or the presence of ions

“Ionization of the gas in the engine caused it to malfunction.”

3. noun

an ion or a group of ions

“The ionization of the metal was responsible for its reaction with the acid.”