This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Something to which one can resort or retreat.

n. A retreat.

n. Computer Science A mechanism for carrying forth programmed instructions despite malfunction or failure of the primary device.

n. Something that falls back: the fallback of a huge explosion.

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

n. An act of falling back.

n. A backup plan or contingency strategy; an alternative which can be used if something goes wrong with the main plan; a recourse.

n. A reduction in bitumen softening point, sometimes called refluxing or overheating in a relatively closed container.

adj. That can be resorted to as a fallback.

n. The act or process of falling back.

n. Something or someone to which one resorts as an alternative to a failed resource or method.

v. retreat

v. fall backwards and down

v. move back and away from

v. have recourse to

v. go back to bad behavior

v. hang (back) or fall (behind) in movement, progress, development, etc.

n. to break off a military action with an enemy

""So, the fallback is to use old studies, done on dissimilar programs (human space flight and Earth/space science missions present very different challenges)""

retrogress    regress    retrograde    recline    lean back    apply    utilise    use    utilize    employ   

modulation fallback    automatic fallback    fallback font   

retreat    recession    plan B    back-up    ebbing    recourse    backup    alternate    secondary    alternative   

onmouseover    cyberculture    challenge-response    username/password    particle-acceleration    vu7uuze-y1nj0au-tw6q847c-0    account.other    pass-through    watermark    user-level