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fallback

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The definition of a fallback is a retreat of a military action, or a backup plan.

(noun)

If a government calls its army to retreat from attacking an enemy fort, this is an example of a fallback.
If you want to go to Harvard but you also apply to Georgetown in case you do not get into Harvard, Georgetown is an example of a fallback.

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See fallback in Webster's New World College Dictionary

noun

something in reserve that one can turn to for help
a withdrawing; retreat

See fallback in American Heritage Dictionary 4

noun

a. Something to which one can resort or retreat.
b. A retreat.
Computer Science A mechanism for carrying forth programmed instructions despite malfunction or failure of the primary device.
Something that falls back: the fallback of a huge explosion.

adjective

Of, relating to, or constituting a resort or place of retreat: a fallback proposal; a fallback position behind our own lines.

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