1. the time between evening and morning when it is dark

1. happening or used during the night

Examples

• The children were afraid to go outside during nighttime.
• Many animals are more active at nighttime than during the day.
• She works the nighttime shift at the hospital.
• The nighttime temperature dropped below freezing.
• We could hear owls hooting in the nighttime darkness.
• The city looks beautiful with all its nighttime lights.
• Nighttime driving requires extra caution.