night night (definition) nīt nīt / exclamation, incantation, plea 1. A spell cast twice for potency, as all true spells must be. 2. The parental subjunctive: may it be night; may you accept that it is night. 3. (archaic) A door closing softly on a lit hallway. 4. (child's usage, inverted) A question disguised as an echo. See also: "Mummy." See also: "no." 5. The smallest unit of time in which a household can shift from chaos to silence. Approximately two minutes. Approximately forever. 6. What remains in the mouth after the child has finally stopped talking — a taste like warm milk and electrical hum. Synonyms: ceasefire, armistice, lullaby's last line. Antonyms: one more story, water please, there's a shadow. Usage note: Must be whispered. Loses all power at conversational volume.