noun: (uncountable) A subgenre of science fiction that depicts advanced technology combined with Victorian style and aesthetics, such as steam-powered machines and vehicles, visible gears and screws and people dressed in 19th-century attires.
noun: (countable) A writer of steampunk fiction.
noun: (countable, cosplay) A person cosplaying as a steampunk character.
verb: (transitive) To depict in a steampunk manner.