Definition of speedrun in US English:

speedrun

noun

  • An instance of completing a video game, or level of a game, as fast as possible.

    ‘a second can make all the difference in a speedrun’

verb

[with object]
  • Complete (a video game, or level of a game) as fast as possible.

    ‘I used to be able to speedrun this game in less than 20 minutes’

Pronunciation

speedrun

/ˈspidˌrən//ˈspēdˌrən/