Twilight — Defs

01 n. The light perceived before the rising, and after the setting, of the sun, or when the sun is less than 18° below the horizon, occasioned by…

1.
The light perceived before the rising, and after the setting, of the sun, or when the sun is less than 18° below the horizon, occasioned by the illumination of the earth's atmosphere by the direct rays of the sun and their reflection on the earth.
2.
faint light; a dubious or uncertain medium through which anything is viewed.
“As when the sun . . . from behind the moon, In dim eclipse, disastrous twilight sheds.” — Milton.

“The twilight of probability.” — Locke.

02 a. Seen or done by twilight.

1.
Seen or done by twilight.
2.
Imperfectly illuminated; shaded; obscure.
“O'er the twilight groves and dusky caves.” — Pope.