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1. A pattern of unwanted or intrusive thoughts or urges that recur persistently, often accompanied by symptoms of anxiety.
2. A compulsive, often unreasonable idea or emotion.
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.