The verb lighten means to reduce weight or increase brightness.
- Talking about problems and sharing solutions help to lighten the burden of parenting.
- This software will help you to lighten the colours in a dark photograph.
The noun meaning “an increase in brightness” is lightening (with an e).
- A noticeable lightening occurred in the eastern sky before sunrise.
The electrical discharge in the sky is lightning (no e).
- Lightning struck the water tower on Queen Street last night.
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