What is the meaning of twinkle?

noun

• A rapid change in brightness; a brief spark or flash.
  • synonyms: scintillation, sparkling
• Merriment expressed by a brightness or gleam or animation of countenance.
  • usage: "he had a sparkle in his eye"; "there's a perpetual twinkle in his eyes"
  • synonyms: sparkle, spark, light

verb

• Gleam or glow intermittently.
  • usage: "The lights were flashing"
  • synonyms: flash, blink, wink, winkle
• Emit or reflect light in a flickering manner.
  • usage: "Does a constellation twinkle more brightly than a single star"
  • synonyms: winkle, scintillate