The time just after sunset, when the light is half-faded, but the world is not yet totally dark, is twilight. If you are between two states, like asleep and awake, that can also be called a twilight moment.

Twilight comes just before the night falls. The early light, just before sunrise, is also technically called "twilight" but most people call it "dawn." The prefix twi- might be a clue that twilight happens twice a day, or it could mean "half," as in the half-light of this time. Something that is declining can be described as twilight — like the twilight of the trend of wearing plastic clogs favored by nurses and chefs.

Definitions of twilight

n the time of day immediately following sunset

“he loved the twilight
crepuscle, crepuscule, dusk, evenfall, fall, gloam, gloaming, nightfall
a shortening of nightfall
Type of:
hour, time of day
clock time

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

Type of:
light, visible light, visible radiation
(physics) electromagnetic radiation that can produce a visual sensation

n a condition of decline following successes

“in the twilight of the empire”
Type of:
declination, decline
a condition inferior to an earlier condition; a gradual falling off from a better state

adj lighted by or as if by twilight

“the twilight glow of the sky”
dusky, twilit
devoid of or deficient in light or brightness; shadowed or black

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