#variation.change__fluctuation  an instance of change; the rate or magnitude of change
  supertype:  #change.happening__alteration__modification  an event that occurs when something passes from one state or phase to another: "the change was intended to increase sales"; "this storm is certainly a change for the worse"
  subtype:  #vicissitude.variation  a variation in circumstances or fortune at different times in your life or in the development of something; "the project was subject to the usual vicissitudes of exploratory research"
  subtype:  #allomerism  (chemistry) variability in chemical composition without variation in crystalline form
  subtype:  #departure__deviation__divergence__difference  a variation that deviates from the standard or norm; "the deviation from the mean"
     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
  subtype:  #substitution.variation__permutation__transposition__replacement__switch  an event in which one thing is substituted for another; "the replacement of lost blood by a transfusion of donor blood"
  subtype:  #business_cycle__trade_cycle__tradecycle  recurring fluctuations in economic activity consisting of recession and recovery and growth and decline
  subtype:  #daily_variation  fluctuations that occur between one day and the next
  subtype:  #diurnal_variation__diurnalvariation  fluctuations that occur during each day
  subtype:  #tide.variation  something that may increase or decrease (like the tides of the sea); "a rising tide of popular interest"

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