Definition of midnight noun from the Oxford Advanced Learner's Dictionary

      

    midnight

     noun
    noun
    BrE BrE//ˈmɪdnaɪt//
     
    ; NAmE NAmE//ˈmɪdnaɪt//
     
    [uncountable]
     
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  1. 1  12 o’clock at night They had to leave at midnight. on the stroke of midnight/shortly after midnight She heard the clock strike midnight. Let’s have a midnight feast tonight (= a secret meal that children like to have in the middle of the night). We have to catch the midnight train.
  2. 2 (especially North American English) = midnight blue
  3. Word Origin Old English midniht (see mid-, night).Extra examples Downstairs in the hall, midnight struck. It was approaching midnight when I finally reached home. On the stroke of midnight, Prince Charming turned back into a rat. The church clock struck midnight. the land of the midnight sun The law comes into effect on the stroke of midnight tomorrow. The ship set sail shortly after midnight. They had to leave at midnight.Idioms to study or work until late at night
    do a moonlight/midnight flit
     
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    (British English, informal) to leave a place suddenly and secretly at night, usually in order to avoid paying money that you owe to somebody
See the Oxford Advanced American Dictionary entry: midnight