1.nounThe soft light in the sky seen before the rising and (especially) after the setting of the sun, occasioned by the illumination of the earth’s atmosphere by the direct rays of the sun and their reflection on the earth.
"I could just make out her face in the twilight."
2.nounThe time when this light is visible; the period between daylight and darkness.
"It was twilight by the time I got back home."
3.nounThe time when the sun is less than 18° below the horizon.
4.nounAny faint light through which something is seen; an in-between or fading condition.
"The twilight of one's life"
5.verbTo illuminate faintly.
6.adjectivePertaining to or resembling twilight; faintly illuminated; obscure.