Pronunciation: (mid'nīt"), [key]
the middle of the night; twelve o'clock at night.
1. of or pertaining to midnight.
2. resembling midnight, as in darkness.
3. burn the midnight oil, to study or work far into the night: After months of burning the midnight oil, he really needed a vacation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.