something that lies outside the main body or group that it is a part of, as a cow far from the rest of the herd, or a distant island belonging to a cluster of islands: The mail, along with eagerly awaited “special orders,” was delivered to the outliers weekly, thanks to Cap'n George and his trusty steamboat.
someone who stands apart from others of his or her group, as by differing actions, beliefs, religious practices, etc.: an outlier among Muslims; an outlier among conservatives.
Geology a part of a formation left detached through the removal of surrounding parts by erosion.
Obsolete a person residing outside the place of his or her business, duty, etc.