Definitions

1. noun

the process of changing neutral atoms into ions, especially by the absorption or ejection of electrons, or the process of ionizing a substance.

“The high-energy radiation caused significant ionisation of the air molecules.”

2. noun

the state of being ionised, or having free ions.

“The high ionisation of the plasma made it difficult to contain.”

3. noun

the removal of electrons from an atom or molecule, leaving a positively charged ion behind.

“The process of ionisation was essential for the development of new electronics.”