/ Dictionary / Index O outlier: Meaning and Definition of Find definitions for: out•li•er Pronunciation: (out'lī"ur), [key] — n. a person or thing that lies outside. a person residing outside the place of his or her business, duty, etc. a part of a formation left detached through the removal of surrounding parts by erosion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: outlier (Thesaurus) outlet outline Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language