| 1. | a book in which records of acts, events, names, etc., are kept. |
| 2. | a list or record of such acts, events, etc. |
| 3. | an entry in such a book, record, or list. |
| 4. | an official document issued to a merchant ship as evidence of its nationality. |
| 5. | registration or registry. |
| 6. | a mechanical device by which certain data are automatically recorded. |
| 7. | cash register. |
| 8. | Music.
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| 9. | a device for controlling the flow of warmed air or the like through an opening, as from a duct to an interior, composed of a number of narrow, parallel blades, usually behind a grating, that may be adjusted so as to overlap and close the opening. |
| 10. | Photography. proper relationship between two plane surfaces in photography, as corresponding plates in photoengraving. |
| 11. | Printing.
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| 12. | a bookmark, esp. a ribbon attached to the spine of a book. |
| 13. | Linguistics. a variety of language typically used in a specific type of communicative setting: an informal register; the register of scientific discourse. |
| 14. | Computers. a high-speed storage location in the CPU, used to store a related string of bits, as a word or phrase. |
| 15. | to enter or cause to be entered formally in a register. |
| 16. | to cause (mail) to be recorded upon delivery to a post office for safeguarding against loss, theft, damage, etc., during transmission. |
| 17. | to enroll (a student, voter, etc.) in a school or course of study, on the voting rolls, etc. |
| 18. | to indicate by a record, as instruments do: The thermometer registered 102 degrees today. |
| 19. | to indicate or show, as on a scale. |
| 20. | Printing. to adjust so as to secure exact correspondence; cause to be in register. |
| 21. | Military. to adjust (fire) on a known point. |
| 22. | to show (surprise, joy, anger, etc.), as by facial expression or by actions. |
| 23. | to document (a merchant ship engaged in foreign trade) by issuing a certificate of registry. |
| 24. | to enter one's name or cause it to be entered in a register; enroll: to register at a motel. |
| 25. | to apply for and obtain inclusion of one's name on the list of voters. |
| 26. | to enroll in a school or course of study: I've registered for three English classes. |
| 27. | Printing. to be in register. |
| 28. | to show: A broad smile registered on his face. |
| 29. | to have some effect; make some impression: My plea didn't register on him at all. |

register
1. One of a small number of high-speed memory locations in a computer's CPU. Registers differ from ordinary random-access memory in several respects:
There are only a small number of registers (the "register set"), typically 32 in a modern processor though some, e.g. SPARC, have as many as 144. A register may be directly addressed with a few bits. In contrast, there are usually millions of words of main memory (RAM), requiring at least twenty bits to specify a memory location. Main memory locations are often specified indirectly, using an indirect addressing mode where the actual memory address is held in a register.
Registers are fast; typically, two registers can be read and a third written -- all in a single cycle. Memory is slower; a single access can require several cycles.
The limited size and high speed of the register set makes it one of the critical resources in most computer architectures. Register allocation, typically one phase of the back-end, controls the use of registers by a compiled program.
See also accumulator, FUBAR, orthogonal, register dancing, register allocation, register spilling.
2. An addressable location in a memory-mapped peripheral device. E.g. the transmit data register in a UART.