miednict : midnight
The Illunse word for midnight is miednict. The Illunse word for night is nict.
This word is a mixture of the Old English word midniht or middelniht, and the similar concept Latin terms multa nocte (late at night) and nox intempesta (the dead of night).
I couldn't find words for midnight in Tolkien's languages of Quenya or Sindarin.