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Ab vs Undefined - What's the difference?

ab | undefined |

As a verb ab

is (first person singular present form of the negation verb).

As an adjective undefined is

lacking a definition or value.

ab

English

(wikipedia ab)

Etymology 1

Abbreviation of (abdominal) (muscles).

Noun

(en noun)
  • (informal) abdominal muscle.
  • * 2006 , H. Peter Steeves, The Things Themselves (page 75)
    • The bikinied models in most of the ESPN2 shows have abs . Many of the malnourished bikinied models in the commercials have visible rib cages. How did the two get conflated into a shared vision of beauty?
  • * 2010 , Bill Geiger, "6-pack Abs in 9 Weeks", Reps! 17:106
    • When possible, do your ab workout on a day when you're not training a major muscle group.
    Usage notes
    Most often used attributively. Substantive use is more common in the plural form (abs).

    Etymology 2

    Abbreviation of (abscess).

    Noun

    (en noun)
  • (slang) An abscess caused by injecting an illegal drug, usually heroin.

    • Etymology 3

    Abbreviations, see definitions.

    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