A formal or official recording of items, names, or actions. A book for such entries. An entry in such a record. The act of registering. A device that automatically records a quantity or number. Computer Science A part of the central processing unit used as a storage location. An adjustable, grill-like device through which heated or cooled air is released into a room. A state of proper alignment: to be in register. Printing Exact alignment of the lines and margins on the opposite sides of a leaf. Printing Proper positioning of colors in color printing. Music The range of an instrument or a voice. Music A part of such a range. Music A group of matched organ pipes; a stop. A variety of language used in a specific social setting: speaking in an informal register; writing in a scientific register. To enter in an official register. To enroll officially or formally, especially in order to vote or attend classes. To set down in writing; record: "It is for the historian to discover and register what actually happened\u201d ( Robert Conquest). To indicate on or as if on an instrument or a scale. To give outward signs of; express: Her face registered surprise. To attain or achieve: registered a new high in sales. To cause (mail) to be officially recorded and specially handled by payment of a fee. To adjust so as to be properly aligned. To place or cause placement of one's name in a register. To have one's name officially placed on a list of eligible voters. To enroll as a student.