fallback

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fallback

[′fȯl‚bak]
(computer science)
The system, electronic or manual, which is substituted for the computer system in case of breakdown.
(geology)
Fragmented ejecta from an impact or explosion crater during formation which partly refills the true crater almost immediately.
(nucleonics)
That part of the material carried into the air by an atomic explosion which ultimately drops back to the earth or water at the site of the explosion.

fallback

A reduction in the softening point of bitumen used in built-up roofing; may result from overheating.