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