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Hydrogeology vs Undefined - What's the difference?

hydrogeology | undefined |

As a noun hydrogeology

is the geology of groundwater, especially concerning the physical, biological and chemical properties of its occurrence and movement.

As an adjective undefined is

lacking a definition or value.

hydrogeology

English

(wikipedia hydrogeology)

Noun

(hydrogeologies)
  • The geology of groundwater, especially concerning the physical, biological and chemical properties of its occurrence and movement.

    • Derived terms

    * hydrogeologist English words suffixed with -ology

    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