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See also: ULP



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Etymology 1[edit]

Imitative, or from gulp?



  1. The sound of a person gulping in fear.
    • 2009 February 10, Joel Rubinoff, “Train wreck keeps rollin' along”, in Toronto Star[1]:
      And where would the Grammys be without Motown maverick Stevie Wonder, continuing his slide into musical irrelevance with a mind-boggling collaboration with, ulp, teen idols the Jonas Brothers, who massacred their own "Burnin' Up" and Stevie's "Superstition" with boyish aplomb.
    • 2009, Charlie Connelly, And Did Those Feet:
      I sent her a text asking as nonchalantly as possible whether cows ever go for you. [] The answer I got was, 'Occasionally they do, and they can be bloody scary.' Ulp.
    • 2015, Jennifer Stevenson, It's Raining Angels and Demons:
      Little—ulp—little red horns curving out of his brow. My mouth was totally dry.

Etymology 2[edit]

Abbreviation of unit in the last place or unit of least precision.


ulp (plural ulps)

  1. (mathematics, computer science) The value that the least significant digit of a floating-point number represents, used as a measure of accuracy in numeric calculations.
    • 1997, Donald E. Knuth, Art of Computer Programming, Volume 2: Seminumerical Algorithms:
      Floating point operations are correct to within half an ulp, and the calculation of uvw by two floating point multiplications will be correct within about one ulp (ignoring second-order terms).
    • 2018, Jean-Michel Muller, Handbook of Floating-Point Arithmetic, page 34:
      It is important to be able to establish links between errors expressed in ulps, and relative errors.




ulp f (invariable)

  1. (mathematics, computer science) ulp (unit in the last place (unità in ultima posizione) or unit of least precision (unità di minore precisione))