Lightening or Lightning?
Your choice!
Lightening
Exemple : ‘’I am in the process of lightening the background.’’
"Lightening" and "lightning" are often misused. "Lightening" is the act of making something lighter in colour.
Lightning
Exemple : ‘’There was a lot of lightning during the storm!’’
"Lightning" is a noun referring to the electric bolts which come from clouds and are accompanied by thunder.