Dusk (noun)

1. The time in the evening when the sun has set but it is not yet dark.
2. The beginning of nightfall.

Origin:

Middle english: from old english dysc, of germanic origin; related to dutch dauw and german dämmerung.

Examples:

1. We arrived at the park at dusk.
2. The sky at dusk was a beautiful orange color.
3. The birds were singing at dusk.
4. The streetlights came on at dusk.
5. The temperature drops quickly at dusk.