(meteorology, astronomy) A very rare phenomenon observed in the morning or evening when the sun is crossing or immediately below the horizon, in which a momentary flash of blue light appears above the upper rim of the solar disk, caused by refraction of light in the atmosphere.

(countable) A fictional story that is briefer than typical short stories. / (uncountable) The genre of such stories.

plural of flash fiction

Alternative form of flashcrowd / A large audience for a sporting event that is unexpected because of large numbers of game-day ticket sales rather than advance tickets. / A crowd that forms suddenly.

A transient occurrence with no long-term effect. / A career notable for early success not followed by significant accomplishment.

(physics) The lowest temperature at which a liquid can form an ignitable mixture in air near the surface of the liquid. / (figuratively) A hotspot; a dangerous place of violent political unrest.

A device that produces a short flash of light to help illuminate a scene, mostly for night-time or indoors photography, to make the picture brighter.

(computer hardware) A small electronic device used to store digital data, more portable and robust than a hard drive.

A group of people who rapidly assemble, perform an unusual and seemingly pointless act, and then quickly disperse.

(computer hardware) A rewritable memory chip that retains its data without a power supply.