1. The soft glowing light from the sky when the sun is below the horizon, either in the evening (dusk) or in the morning (dawn)
The city looked beautiful in the twilight hours.
A cidade parecia bonita durante as horas do crepúsculo.
2. A period of decline or transition; a state between two conditions
The company was in the twilight of its existence.
A empresa estava no crepúsculo de sua existência.