2 : a fastener for locking together two toothed edges by means of a sliding tab
3 : the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more
4 : abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light
5 : a lamp for providing momentary light to take a photograph
6 : a very short time (as the time it takes the eye to blink or the heart to beat)
