See more synonyms for midnight on Thesaurus.com
  1. of or relating to midnight.
  2. resembling midnight, as in darkness.
  1. burn the midnight oil, to study or work far into the night: After months of burning the midnight oil, he really needed a vacation.

Origin of midnight

before 900; Middle English; Old English midniht. See mid-, night
Related formsmid·night·ly, adjective, adverbpost·mid·night, adjectivepre·mid·night, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for midnight


    1. the middle of the night; 12 o'clock at night
    2. (as modifier)the midnight hour
  1. burn the midnight oil to work or study late into the night
Derived Formsmidnightly, adjective, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for midnight

Old English mid-niht, or middre niht (with dative). See mid + night. Midnight oil symbolizing "late night work" is attested from 1630s.

Online Etymology Dictionary, © 2010 Douglas Harper