SEPARATE [I, T] › If two sides of something part, they become separated, and if you part them, you make them separate: Slowly her lips parted and she smiled. LEAVE [I, T] formal › If two people part, or if one person parts from another, they leave each other: That summer, after six years of marriage, we parted. Even after we parted company, we remained in contact. HAIR [T] › to brush your hair in two directions so that there is a straight line showing on your head: In my school days, I had long hair parted in the middle.