#departure__deviation__divergence__difference  a variation that deviates from the standard or norm; "the deviation from the mean"
  supertype:  variation.change__fluctuation  an instance of change; the rate or magnitude of change
  subtype:  discrepancy__variant  an event that departs from expectations
  subtype:  driftage  the deviation (by a vessel or aircraft) from its intended course due to drifting
  subtype:  flection__inflection  deviation from a straight or normal course

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