1. the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight
2. the quality of shining with a bright reflected light
Synonym: glitterglisterglistensparkle
3. a brilliant display of wit
4. a rapid change in brightness
a brief spark or flash
5. (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle