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1. One that lives or is located outside or at the edge of a given area: outliers of the forest standing in the field.
2. One that exists outside or at an extreme of a category, pattern, or expectation; an extreme case or exception: "those egg-laying outliers of mammaldom, the duck-billed platypus and the anteating echidna" (Natalie Angier).
3. A value far from most others in a set of data: "Outliers make statistical analyses difficult" (Harvey Motulsky).
4. A portion of stratified rock separated from a main formation by erosion.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Geological Science) an outcrop of rocks that is entirely surrounded by older rocks
2. a person, thing, or part situated away from a main or related body
3. a person who lives away from his place of work, duty, etc
4. (Statistics) statistics a point in a sample widely separated from the main cluster of points in the sample. See scatter diagram
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈaʊtˌlaɪ ər)

1. a person residing away from a business, duty, etc.
2. Geol. a part of a formation left detached through the removal of surrounding parts by erosion.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.outlier - a person who lives away from his place of work
occupant, occupier, resident - someone who lives at a particular place for a prolonged period or who was born there
2.outlier - an extreme deviation from the mean
statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
deviation - the difference between an observed value and the expected value of a variable or function
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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References in periodicals archive ?
In any event, we typically do not want to simply delete the outlying observation. However, if the data contains significant outliers, we may need to consider the use of robust statistical techniques.
The signal is caused by 1 outlying observation within sample number 10.
1990) will make the area estimate highly sensitive to outlying observations. An outlying observation will have a high harmonic mean value, and thus will force the inclusion of many grid points.
Since an outlying observation may be merely an extreme manifestation of the random variability inherent in the data and there is a chance of an error in calculating or recording a numerical result.So outliers are detected by applying different techniques.
However, the level of employment remains about 3/4 per cent below the level predicted by our equation, which is lower than at any other point in the last 35 years apart from a single outlying observation in 1975.
Robust coefficients alpha and omega and confidence intervals with outlying observations and missing data: methods and software.
The regression analysis suggests that the observations 6 and 17 are the outlying observations expected to show large influence while the observation 4 and 20 are having large residual.