GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Outlier (?), n.
   1. One who does not live where his office, or business, or estate, is.  Bentley.
   
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   2. That which lies, or is, away from the main body.
   
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   3. (Geol.) A part of a rock or stratum lying without, or beyond, the main body, from which it has been separated by denudation.
   
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   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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