an adjective denoting "at, or of, midnight," is used as a noun in Mark 13:35; Luke 11:5; Acts 16:25; 20:7 .
Note: In Matthew 25:6 "at midnight" translates the adjective mesos, and noun nux, "night," in the combined adverbial phrase. In Acts 27:27 "about midnight" translates an adverbial phrase consisting of kata, "towards," followed by mesos, "middle" and nux, "night," with the article, lit., "towards (the) middle of the night." See MIDST.