The Collaborative International Dictionary of English v.0.48:

Glimmering \Glim"mer*ing\, n.
   1. Faint, unsteady light; a glimmer. --South.
      [1913 Webster]

   2. A faint view or idea; a glimpse; an inkling.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Glimmer \Glim"mer\, v. i. [imp. & p. p. Glimmered; p. pr. &
   vb. n. Glimmering.] [Akin to G. glimmer a faint, trembling
   light, mica, glimmern to glimmer, glimmen to shine faintly,
   glow, Sw. glimma, Dan. glimre, D. glimmen, glimpen. See
   Gleam a ray, and cf. Glimpse.]
   To give feeble or scattered rays of light; to shine faintly;
   to show a faint, unsteady light; as, the glimmering dawn; a
   glimmering lamp.
   [1913 Webster]

         The west yet glimmers with some streaks of day. --Shak.

   Syn: To gleam; to glitter. See Gleam, Flash.
        [1913 Webster]

WordNet (r) 3.0 (2006):

glimmering
    n 1: a slight suggestion or vague understanding; "he had no
         inkling what was about to happen" [syn: inkling,
         intimation, glimmering, glimmer]