1. [n]  a rapid change in brightness; a brief spark or flash
2. [v]  gleam or glow intermittently; "The lights were flashing"
3. [v]  emit or reflect light in a flickering manner; of stars; "Does a constellation twinkle more brightly than a single star?"

Twinkle
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1. \Twin"kle\, v. i. [imp. & p. p. {Twinkled}; p. pr. & vb.
   n. {Twinkling}.] [OE. twinklen, AS. twinclian; akin to OE.
   twinken to blink, wink, G. zwinken, zwinkern, and perhaps to
   E. twitch.]
   1. To open and shut the eye rapidly; to blink; to wink.
            The owl fell a moping and twinkling.  --L' Estrange.
   2. To shine with an intermitted or a broken, quavering light;
      to flash at intervals; to sparkle; to scintillate.
            These stars not twinkle when viewed through
            telescopes that have large apertures. --Sir I.
                                                  Newton.
            The western sky twinkled with stars.  --Sir W.
                                                  Scott.
   

2. \Twin"kle\, n.
   1. A closing or opening, or a quick motion, of the eye; a
      wink or sparkle of the eye.
            Suddenly, with twinkle of her eye, The damsel broke
            his misintended dart.                 --Spenser.
   2. A brief flash or gleam, esp. when rapidly repeated.
   3. The time of a wink; a twinkling. --Dryden.