sei·zure (s??zh?r)n.1. The act or an instance of seizing or the condition of being seized.2. A sudden attack, spasm, or convulsion, as in epilepsy or another disorder.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.seizure (?si???) n1. the act or an instance of seizing or the state of being seized2. (Pathology) pathol a sudden manifestation or recurrence of a disease, such as an epileptic convulsionCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014sei?zure (?si ??r) n. 1. an act or instance of seizing. 2. the state of being seized. 3. a taking possession of an item, property, or person legally or by force. 4. a sudden attack, as of epilepsy. [1475?85] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.