From The Collaborative International Dictionary of English v.0.48:

Outlier \Out"li`er\, n.
   1. One who does not live where his office, or business, or
      estate, is. --Bentley.
      [1913 Webster]

   2. That which lies, or is, away from the main body.
      [1913 Webster]

   3. (Geol.) A part of a rock or stratum lying without, or
      beyond, the main body, from which it has been separated by
      [1913 Webster]

   4. (Statistics) A datum that lies significantly beyond the
      main cluster of data points on a graph or diagram; --
      suggestive of an error in measurement.
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