1. converts (an atom or molecule) into an ion by removing or adding electrons
Usage: British spelling; American English uses 'ionizes'; chemistry term

Examples

• Ultraviolet radiation ionises oxygen molecules in the upper atmosphere.
• The device ionises the air to remove odors and allergens.
• When salt dissolves in water, it ionises into sodium and chloride ions.
• High-energy particles ionise atoms as they pass through matter.
• The process ionises the gas, creating a plasma.