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.
  "There's railroad trains, a lot of steam-driven stuff, but that's about it. More ‘steam punk’, I suppose."
• (countable) A writer of steampunk fiction.
  "Personally, I think Victorian fantasies are going to be the next big thing, as long as we can come up with a fitting collective term for Powers, [James] Blaylock and myself. Something based on the appropriate technology of the era; like steam-punks, perhaps..."
• (countable, cosplay) A person cosplaying as a steampunk character.
  "It wound up being an overwhelmingly positive experience that made me appreciate the steampunks around me even more."

verb

• (transitive) To depict in a steampunk manner.
  "[Director Paul W.S.] Anderson's answer to the question of what to update in this film seems to be: steampunk everything. Hence the elaborate airship contraptions and weapons, all made in wood and iron and powered by choo-choo engines. What seems to be missing is the why. When far-fetched techno-bits and bobs are put into a story, these items must have a meaning and purpose. Here, the gadgets are throwaway items used for their visual effect, then discarded."