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Fallback vs Undefined - What's the difference?

fallback | undefined |

As adjectives the difference between fallback and undefined

is that fallback is that can be resorted to as a fallback while undefined is lacking a definition or value.

As a noun fallback

is an act of falling back.

fallback

English

Alternative forms

* fall-back

Noun

(en noun)
  • An act of falling back.
  • A backup plan or contingency strategy; an alternative which can be used if something goes wrong with the main plan; a recourse.
    • As a fallback, I suppose we can use typewriters if the word processing system fails.
  • (construction) A reduction in bitumen softening point, sometimes called refluxing or overheating in a relatively closed container.

    • Synonyms

    * (act of falling back) ebbing, recession, retreat * (backup plan) back-up/backup, plan B, recourse

    Derived terms

    * automatic fallback * modulation fallback

    Adjective

    (-)
  • That can be resorted to as a fallback.
    • a fallback plan

    Synonyms

    * alternate/alternative, back-up/backup, secondary

    Derived terms

    * fallback font

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined