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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 denudation. [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. [PJC]