From WordNet (r) 2.0 (August 2003) [wn]:
gloaming
n : the time of day immediately following sunset; "he loved the
twilight"; "they finished before the fall of night" [syn:
twilight, dusk, nightfall, evenfall, fall,
crepuscule, crepuscle]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Gloaming \Gloam"ing\, n. [See Gloom.]
1. Twilight; dusk; the fall of the evening. [Scot. & North of
Eng., and in poetry.] --Hogg.
[1913 Webster]
2. Sullenness; melancholy. [Obs.] --J. Still.
[1913 Webster]