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Coupler vs Undefined - What's the difference?

coupler | undefined |

As a noun coupler

is someone who couples things together, especially someone whose job it is to couple railway carriages.

As an adjective undefined is

lacking a definition or value.

coupler

English

(wikipedia coupler)

Noun

(en noun)
  • Someone who couples things together, especially someone whose job it is to couple railway carriages.
  • Anything that serves to couple things together; but especially a device that couples railway carriages.
  • (music) A device that connects two keyboards of an organ together so that they play together.
  • A device used to convert electronic information into audible sound signals for transmission over telephone lines.
  • An electrical device used to transfer energy from one electric device to another, especially without a physical connection.
    • ----

    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