Definition of "Twilight" :

noun: the diffused light from the sky when the sun is below the horizon but its rays are refracted by the atmosphere of the earth

noun: a condition of decline following successes

"In the twilight of the empire."

noun: the time of day immediately following sunset

"He loved the twilight."

adjective: lighted by or as if by twilight

"The twilight glow of the sky."