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n. pl. a·nom·a·lies
1. Deviation or departure from the normal or common order, form, or rule.
2. One that is peculiar, irregular, abnormal, or difficult to classify: "Both men are anomalies: they have ... likable personalities but each has made his reputation as a heavy" (David Pauly).
3. Astronomy The angular deviation, as observed from the sun, of a planet from its perihelion.
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.