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 for register
From The Free On-line Dictionary of Computing (30 December 2018) :

     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
     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.

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