"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.
young children should not be allowed to stay up until midnight
MIDI
Midi
midland
midlife
midmost
midnight
midpoint
Midrash
midriff
midsection
midshipman
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