<p><strong>Noun</strong></p><ul><li>the act of scintillating; sparkling.</li><li>a spark or flash.</li><li>Astronomy. the twinkling or tremulous effect of the light of the stars.</li><li>Meteorology. any small-scale twinkling or shimmering of objects that are viewed through the atmosphere, caused by an interception of the observer's line of view by inhomogeneities in the atmospheric refractive index.</li><li>Physics. a flash of light from the ionization of a phosphor struck by an energetic photon or particle.</li><li>random fluctuation of the amplitude, phase, or polarization of an electromagnetic wave.</li><li>(on a radar display) a slight, rapid shifting of a spot of light or the image of an object about its mean position.</li></ul>