Definition of outlier
1
: a person whose residence and place of business are at a distance
- His house was a place of refuge for outliers.
2
: something (such as a geological feature) that is situated away from or classed differently from a main or related body
- The island is an outlier on the southeast side of the archipelago.
3
: a statistical observation that is markedly different in value from the others of the sample
- Values that are outliers give disproportionate weight to larger over smaller values.
