1. A rock moved from one location to another, usually by a glacier.
  2. Anything that has erratic characteristics.


  1. unsteady, random; prone to unexpected changes; not consistent
    Henry has been getting erratic scores on his tests: 40% last week, but 98% this week.
  2. Deviating from the common course in opinion or conduct; eccentric; odd.
    erratic conduct

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