noun (n)

• a variation that deviates from the standard or norm(noun.event)

  Example:
  The deviation from the mean.
  

  Synonym:
  departure, difference, divergence
  

  source: wordnet30
• the difference between an observed value and the expected value of a variable or function(noun.cognition)

  source: wordnet30
• the error of a compass due to local magnetic disturbances(noun.attribute)

  source: wordnet30
• deviate behavior(noun.act)

  Synonym:
  deviance
  

  source: wordnet30
• a turning aside (of your course or attention or concern)(noun.act)

  Synonym:
  deflection, deflexion, digression, divagation, diversion
  

  source: wordnet30
• The act of deviating; a wandering from the way; variation from the common way, from an established rule, etc.; departure, as from the right course or the path of duty.(noun)

  source: webster1913