The term 'AURA' is a four-letter solution to the crossword puzzle for the term 'Sensation Preceding a Migraine'. An AURA is a neurological symptom that can occur before a migraine headache. It is typically experienced as a visual disturbance, such as flashing lights or zigzag lines, but can also include other sensations such as numbness or tingling. Auras can last anywhere from a few minutes to an hour before the onset of a migraine.