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Planespotting vs Undefined - What's the difference?

planespotting | undefined |

As a noun planespotting

is the observation and logging of the registration numbers (tailnumbers) of aircraft as a hobby.

As an adjective undefined is

lacking a definition or value.

planespotting

English

(wikipedia planespotting)

Noun

(-)
  • The observation and logging of the registration numbers (tailnumbers) of aircraft as a hobby.

    • Related terms

    * planespotter * trainspotting

    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