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(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.

SWAP (severe weather avoidance plan)

An approved plan to minimize the effect of severe adverse weather to traffic flows in affected terminal and/or ARTCC (air traffic control center) areas. This plan is put into operation when flight through an airspace is either not possible or is difficult. Such a plan should cause minimum disruption.
References in periodicals archive ?
September 2002, the book value of the swapped assets was
In a symbolic gesture, Technology Crossover Ventures (TCV) partner Michael Linnert today swapped $8 million for his favorite CD, Barry Manilow's Greatest Hits, with Switchouse, a leading person-to-person swapping site.
Seventy-five percent of consumers have recently swapped items with a friend or family member offline, according to a December 1999 NetPulse survey conducted by Greenfield Online.