n. 1. Archaic term for a register. On-line use of it
as a synonym for 'register' is a fairly reliable indication that
the user has been around for quite a while and/or that the
architecture under discussion is quite old. The term in full is
almost never used of microprocessor registers, for example, though
symbolic names for arithmetic registers beginning in 'A' derive
from historical use of the term 'accumulator' (and not, actually,
from 'arithmetic'). Confusingly, though, an 'A' register name
prefix may also stand for 'address', as for example on the
Motorola 680x0 family.
2. A register being used for arithmetic or
logic (as opposed to addressing or a loop index), especially one
being used to accumulate a sum or count of many items. This use is
in context of a particular routine or stretch of code.
FOOBAZ routine uses A3 as an accumulator."
3. One's in-basket
(esp. among old-timers who might use sense 1).
"You want this
reviewed? Sure, just put it in the accumulator."