Sunset/ˈsʌnset/ Definition 1 of 4Pro Tip 1/2Time Specific Use 'sunset' to refer to a specific time in the evening, not just any time after noon. The picnic starts at sunset, around 8 PM today. Pro Tip 2/2Visibility Matters 'Sunset' suggests the sun is visible, unlike 'dusk' where it may have already set. Clear skies promise a beautiful sunset.