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]

Moby Thesaurus II by Grady Ward, 1.0:

116 Moby Thesaurus words for "norm":
   Procrustean law, Ten Commandments, Weltanschauung, Zeitgeist,
   average, axiology, balance, barometer, behavioral norm, benchmark,
   business ethics, canon, center, check, climate, climate of opinion,
   code, code of ethics, code of morals, commandment, convention,
   criterion, decalogue, degree, dictum, ethic, ethical system,
   ethics, ethos, form, formality, formula, formulary, gauge,
   general principle, generality, golden mean, golden rule,
   graduated scale, guideline, guiding principle, happy medium,
   ideology, imperative, intellectual climate, juste-milieu, law,
   law of nature, legal ethics, maxim, mean, measure, median,
   medical ethics, mediocrity, medium, middle, middle course,
   middle ground, middle point, middle position, middle state,
   middle-of-the-road, midpoint, mitzvah, model, moral, moral climate,
   moral code, moral principles, morals, mores, new morality, norma,
   normal, normative system, norms, order of nature, ordinance, par,
   parameter, pattern, prescribed form, prescription, principium,
   principle, principles, professional ethics, quantity, reading,
   readout, regulation, rubric, rule, run, scale, set form,
   settled principle, social ethics, spiritual climate, standard,
   standards, standing order, tenet, test, touchstone, type,
   universal law, usual, value, value system, via media,
   working principle, working rule, world view, yardstick



The Free On-line Dictionary of Computing (30 December 2018):

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)