ETYM Old Eng. registre, French registre, Late Lat. registrum,regestum, Latin regesta, pl., from regerere, regestum, to carry back, to register; pref. re- re- + gerere to carry. Related to Jest, Regest.
1. A book in which names and transactions are listed.
2. A device (as a sliding plate) for regulating the flow of air into a furnace or other heating device.
3. An arrangement (usually in the floor or a wall of a room) for admitting or excluding heated air from the room.
4. An official written record of names or events or transactions; SYN. registry.
5. The timbre characteristic of a certain range and manner of production of the human voice.
In music, a set of organ pipes, controlled by one stop, used in registration. Also, a certain vocal or instrumental range of pitches, often associated with a characteristic timbre, for example, the chalumeau register of a clarinet or the head voice register of a singer.
A set of bits of high-speed memory within a microprocessor or other electronic device, used to hold data for a particular purpose. Each register in a central processing unit is referred to in assembly language programs by a name such as AX (the register that contains the results of arithmetic operations in an Intel 80x86 processor) or SP (the register that contains the memory address of the top of the stack in various processors).
In computing, a memory location that can be accessed rapidly; it is often built into the computer's central processing unit.
Some registers are reserved for special tasks—for example, an instruction register is used to hold the machine-code command that the computer is currently executing, while a sequence-control register keeps track of the next command to be executed. Other registers are used for holding frequently used data and for storing intermediate results.