Etymology
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midnight (n.)

"the middle of the night, 12 o'clock at night," Old English mid-niht, or middre niht (with dative of adjective). See mid (adj.) + night. Compare similar formation in Old High German mittinaht, German Mitternacht. Midnight oil symbolizing "late night work" is attested from 1630s.

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Definitions of midnight

midnight (n.)
12 o'clock at night; the middle of the night;
young children should not be allowed to stay up until midnight
From wordnet.princeton.edu