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Postcard vs Undefined - What's the difference?

postcard | undefined |

As a noun postcard

is a rectangular piece of thick paper or thin cardboard intended to be written on and mailed without an envelope in the case of a picture postcard one side carries a picture or photograph.

As an adjective undefined is

lacking a definition or value.

postcard

English

(wikipedia postcard)

Alternative forms

* post card

Noun

(en noun)
  • A rectangular piece of thick paper or thin cardboard intended to be written on and mailed without an envelope. In the case of a picture postcard one side carries a picture or photograph.

    • See also

    * letter

    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