postmidnight

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective postmidnight is

after midnight, but generally before dawn.

As a proper noun dawn

is sometimes given to a girl born at that time of day.

As an adjective postmidnight is

after midnight, but generally before dawn.

Postmidnight is a derived term of midnight.

As a adjective postmidnight

is after midnight, but generally before dawn.

As a noun midnight is

the middle of the night; 12:00 am; on a 12-hour clock, 12:00 at night; on a 24-hour clock, 00:00.