“lightning” vs. “lightening”

Use "lightning" for the electrical storm phenomenon or extreme speed; use "lightening" for the ongoing process of becoming lighter in weight, color, or mood.

The real distinction

These two share the exact same root — "light" — but diverged in spelling once "lightning" (the storm phenomenon) dropped its middle "e" to become a distinct, fixed spelling, while "lightening" (the ongoing act of making something lighter) kept the full form. This is one of the more genuinely tricky pairs in English because they aren't identical in pronunciation for careful speakers, but they're close enough, and visually similar enough, that writers frequently drop or add the extra "e" by mistake. "Lightning" is always the weather phenomenon or, in idioms, something extremely fast ("lightning-fast reflexes"). "Lightening" always describes an ongoing process of becoming lighter in weight, color, or mood. If your sentence involves a storm or extreme speed, drop the middle "e" for "lightning"; if it involves an active process of becoming lighter, keep the full "lighten" plus "-ing." Meteorology writing tracks lightning strikes, storm cells, and safety protocols using the fixed, no-middle-e spelling exclusively. Hair-care and mood-related writing, by contrast, uses "lightening" to describe an active, ongoing change — hair gradually lightening after a treatment, or a mood lightening as good news arrives.

Examples with “lightning”

• Lightning split the sky just before the thunder rolled in.
• The sprinter had lightning-fast reflexes off the starting blocks.
• A bolt of lightning knocked out power across the neighborhood.
• Photographers waited hours to capture the perfect lightning shot.
• The storm brought heavy rain, thunder, and constant lightning.
• Lightning rarely strikes the same spot twice, despite the saying.
• The old barn was struck by lightning during the summer storm.
• Her lightning wit left the entire audience laughing.
• Meteorologists tracked the lightning strikes across the county.
• The storm chaser caught a rare shot of forked lightning.
• His lightning reflexes saved the falling vase.
• The flash of lightning briefly lit the entire valley.
• A rare instance of ball lightning startled the hikers.
• Distant lightning flickered silently over the horizon.
• The championship hinged on the goalie's lightning save.
• Forecasters warned of scattered lightning through the evening.
• The photographer specialized in capturing lightning over the desert.

Examples with “lightening”

• The sky was slowly lightening as dawn approached.
• She's lightening her workload before the holidays.
• The hairdresser recommended a gradual lightening treatment.
• He's been lightening the mood with jokes all evening.
• The paint dried, gradually lightening to a soft cream.
• They're lightening the boat's load before the long voyage.
• The therapist focused on lightening her sense of guilt.
• The room felt like it was lightening as the curtains opened.
• The dye gradually lightened her hair over several sessions.
• News of the rescue was lightening everyone's mood.
• The overcast sky was slowly lightening by mid-morning.
• The stain slowly lightened after repeated washing.
• Volunteers worked at lightening the flood victims' burden.
• The bleach was slowly lightening the stained fabric.
• Good news kept lightening the mood at dinner.
• The bruise was slowly lightening after a week of ice.
• The sky kept lightening as the storm finally passed.

Memory trick

"Lightning" struck out its middle "e" the way a bolt strikes fast — quick, sharp, no time to waste on extra letters. "Lightening" keeps its full "lighten" spelling because it's a slower, ongoing process, just like gradually turning up the lights in a room.