evenfall

from WordNet (r) 3.0 (2006)

evenfall
    n 1: the time of day immediately following sunset; "he loved the
         twilight"; "they finished before the fall of night" [syn:
         {twilight}, {dusk}, {gloaming}, {gloam}, {nightfall},
         {evenfall}, {fall}, {crepuscule}, {crepuscle}]

from The Collaborative International Dictionary of English v.0.48

Evenfall \E"ven*fall`\, n.
   Beginning of evening. "At the quiet evenfall." --Tennyson.
   [1913 Webster]