Open English Wordnet
Nouns
(n)twilightthe diffused light from the sky when the sun is below the horizon but its rays are refracted by the atmosphere of the earth (n)twilighta condition of decline following successes“in the twilight of the empire” Adjectives
(s)dusky, twilight, twilitlighted by or as if by twilight“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”