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Vacay vs Undefined - What's the difference?

vacay | undefined |

As a noun vacay

is (informal|us) vacation.

As an adjective undefined is

lacking a definition or value.

vacay

English

Noun

(en noun)
  • (informal, US) vacation
    • You're on vacay till the new boss comes in.
    English clippings

    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