The Collaborative International Dictionary of English v.0.48:

Norm \Norm\, n. [L. norma a rule. See Normal, a.]
   [1913 Webster]
   1. A rule or authoritative standard; a model; a type; as,
      deviations from the norm are not tolerated.
      [1913 Webster +PJC]

   2. (Biol.) A typical, structural unit; a type. --Agassiz.
      [1913 Webster]

WordNet (r) 3.0 (2006):

norm
    n 1: a standard or model or pattern regarded as typical; "the
         current middle-class norm of two children per family"
    2: a statistic describing the location of a distribution; "it
       set the norm for American homes" [syn: average, norm]

The Free On-line Dictionary of Computing (19 January 2023):

norm

    A real-valued function modelling the length of
   a vector.  The norm must be homogeneous and symmetric
   and fulfil the following condition: the shortest way to reach
   a point is to go straight toward it.  Every convex symmetric
   closed surface surrounding point 0 introduces a norm by
   means of Minkowski functional; all vectors that end on the
   surface have the same norm then.

   The most popular norm is the Euclidean norm.

   (2004-02-15)