- The definition of midnight is 12:00 at night.
When it turns 12:00 AM, this is an example of midnight.
- twelve o'clock at night; the middle of the night
- deep darkness
- of or at midnight
- like or suggestive of midnight; very dark: midnight blue
burn the midnight oil
to study or work very late at night
- The middle of the night, specifically 12 o'clock at night.
- a. Intense darkness or gloom.b. A period of darkness and gloom.