Swap

verb (used with object), swapped, swapping.
1.
to exchange, barter, or trade, as one thing for another:
He swapped his wrist watch for the radio.
verb (used without object), swapped, swapping.
2.
to make an exchange.
noun
3.
an exchange:
He got the radio in a swap.
verb swaps, swapping, swapped, swops, swopping, swopped
1.
to trade or exchange (something or someone) for another
noun
2.
an exchange
3.
something that is exchanged
4.
(finance) Also called swap option, swaption. a contract in which the parties to it exchange liabilities on outstanding debts, often exchanging fixed interest-rate for floating-rate debts (debt swap), either as a means of managing debt or in trading (swap trading)

operating system
To move a program from fast-access memory to a slow-access memory (“swap out”), or vice versa (“swap in”). The term often refers specifically to the use of a hard disk (or a swap file) as virtual memory or “swap space”.
When a program is to be executed, possibly as determined by a scheduler, it is swapped into core for processing; when it can no longer continue executing for some reason, or the scheduler decides its time slice has expired, it is swapped out again.
This contrasts with “paging” systems in which only parts of a program’s memory is transfered.
[Jargon File]
(1996-11-22)
SWAP
severe weather avoidance procedures