1. a natural light display in the sky, especially in polar regions, caused by the interaction of solar particles with the Earth’s magnetic field
Usage: also called northern lights or southern lights
2. the early light of dawn
Usage: literary

Examples

• The aurora borealis painted the night sky with green and purple streaks.
• Tourists traveled to Alaska hoping to see the spectacular aurora.
• Scientists study the aurora to understand solar wind interactions.
• The aurora was visible as far south as Minnesota last night.
• She woke at aurora to watch the sun rise over the mountains.
• The poet described the aurora as nature’s gentle awakening.