Twilight (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 the illumination of the earth's atmosphere by the direct rays of the sun and their reflection on the earth.

Twilight (n.) faint light; a dubious or uncertain medium through which anything is viewed.

Twilight (a.) Seen or done by twilight.

Twilight (a.) Imperfectly illuminated; shaded; obscure.