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Piston vs Undefined - What's the difference?

piston | undefined |

As a proper noun piston

is .

As an adjective undefined is

lacking a definition or value.

piston

English

(wikipedia piston)

Noun

(en noun)
  • A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
  • (music) A valve device in some brass instruments for changing the pitch

    • Derived terms

    * piston rod * piston ring * pistoning

    Verb

    (en verb)
  • To move up and down like a piston.

    • Anagrams

    * ----

    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