Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Cosplay" Definition
noun
This sense?) (countable) a costume that imitates a (usually fictional) character, especially from japanese media (such as manga, anime, tokusatsu, video games, and japanese pop music bands).
Source: Wiktionary
This sense?) (uncountable) the subculture centered on people wearing such costumes.
Source: Wiktionary
The art or practice of costuming oneself as a (usually fictional) character.
Source: Wiktionary
This sense?) a skit or instance of such play.
Source: Wiktionary
verb
To costume oneself as (a character).
Source: Wiktionary
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