1. the process of making or becoming lighter in weight
2. the process of making or becoming lighter in color or brightness

1. present participle of lighten; making or becoming lighter in weight, color, or mood

Examples

• The lightening of her backpack made the hike much easier.
• Hair lightening products can damage your scalp if used incorrectly.
• The lightening of the sky indicated dawn was approaching.
• She noticed a gradual lightening of her mood after the vacation.
• The artist was lightening the paint with white pigment.
• Lightening the load helped the truck climb the steep hill.
• The lightening effect of the new lamp brightened the entire room.