What is the meaning of twilight?

noun

• The time of day immediately following sunset.
  • usage: "he loved the twilight"; "they finished before the fall of night"
  • synonyms: dusk, gloaming, gloam, nightfall, evenfall, fall, crepuscule, crepuscle
• The diffused light from the sky when the sun is below the horizon but its rays are refracted by the atmosphere of the earth.
• A condition of decline following successes.
  • usage: "in the twilight of the empire"

adjective

• Lighted by or as if by twilight.
  • usage: "The dusky night rides down the sky/And ushers in the morn-Henry Fielding; "the twilight glow of the sky"; "a boat on a twilit river"
  • synonyms: dusky, twilit