Midnight (noun)

12 o'clock at night; the middle of the night.

Origin:

Middle english midniht, from old english midniht, from mid 'middle' + niht 'night'.

Examples:

1. I always stay up until midnight on New Year's Eve.
2. The party was still going strong at midnight.
3. She finally got to bed at midnight after a long day.
4. At midnight, the old year officially ends and the new year begins.
5. The witching hour is often said to be midnight.