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Twilight is the time between darkness and sunrise in the morning, and sunset and complete darkness in the evening, when there is light outside, but the Sun is below the horizon. There are 3 types of twilight: civil, nautical, and astronomical. Dubai skyline in twilight.
5. a period in which strength, importance, etc, are waning: the twilight of his life. 6. (modifier) a. of or relating to the period towards the end of the day: the twilight shift. b. of or relating to the final phase of a particular era: the twilight days of the Bush presidency. c. denoting irregularity and obscurity: a twilight existence.