Definitions for outlierˈaʊtˌlaɪ ər
Random House Webster's College Dictionary
a person residing away from a business, duty, etc.
Geol. a part of a formation left detached through the removal of surrounding parts by erosion.
Origin of outlier:
a person who lives away from his place of work
an extreme deviation from the mean
A person or thing away from others or outside its proper place.
A part of a formation separated from the rest of the formation by erosion.
A value in a statistical sample which does not fit a pattern that describes most other data points; specifically, a value that lies 1.5 IQR beyond the upper or lower quartile.