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The act or practice of dressing in costume, often homemade, to resemble or portray a fictional character, especially from science fiction, fantasy, manga, or anime.
v. cos·played, cos·play·ing, cos·plays
To engage in cosplay.
To portray (a character) through cosplay: She cosplayed her favorite superhero at a comic book convention.
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.
a recreational activity in which people interact with one another while dressed as fictional characters
[C20: shortened from costume play]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014