Definition of flash noun from the Oxford Advanced American Dictionary

     

    flash

     noun
    noun
    NAmE//flæʃ//
     
     
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    light
  1. 1[countable] a sudden bright light that shines for a moment and then disappears a flash of lightning Flashes of light were followed by an explosion. There was a blinding flash and the whole building shuddered.
  2. signal
  3. 2[countable] the act of shining a light on something, especially as a signal
  4. sudden idea/emotion
  5. 3 [countable] flash of something a particular feeling or idea that suddenly comes into your mind or shows on your face a flash of anger/inspiration, etc. When she looked at me, I caught a flash of recognition in her eyes. “Did you really win first prize?” he said with a flash of genuine admiration.
  6. of bright color
  7. 4[countable] flash of something the sudden appearance for a short time of something bright a flash of white teeth On the horizon, she saw a flash of silver—the sea!
  8. in photography
  9. 5[countable, uncountable] a piece of equipment that produces a bright light for a very short time, used for taking photographs indoors, when it is dark, etc.; the use of this when taking a photograph a camera with a built-in flash I'll need flash for this shot. flash photography
  10. news
  11. 6 [countable] = news flash
  12. computing
  13. 7 Flash™ [uncountable] a program that creates moving images for websites see also hot flash
  14. Idioms
    a flash in the pan
     
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    a sudden success that lasts only a short time and is not likely to be repeated He needed to prove that his success was not just a flash in the pan.
    in/like a flash
     
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    very quickly and suddenly The weekend seemed to be over in a flash. The answer came to me like a flash.
    (as) quick as a flash/wink
     
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    very quickly Quick as a wink she was at his side.
See the Oxford Advanced Learner's Dictionary entry: flash