Scintillation definition

(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

(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