1. (n.) The middle of the night; twelve o'clock at night.

2. (a.) Being in, or characteristic of, the middle of the night; as, midnight studies; midnight gloom.

all-night atramentous black black as coal black as ebony black as ink black as midnight black as night coal-black coaly dark dark as night dark as pitch dead of night deep black ebony hush of night ink-black inky jetty night night-black night-dark night-fallen nightlong nightly nighttime nigrous nocturnal noonday night pitch-black pitch-dark pitchy raven raven-black sable sloe sloe-black sloe-colored tar-black tarry