Noun

1. A play-through of a computer or video game in which the whole game or a select part of it, such as a single level, is played with the intent of completing it as quickly as possible, optionally with certain prerequisites.

   In the speedrun of Super Mario Bros. 3, Anonymous Jones finishes the whole game in just 11 minutes.

Verb

1. To create a speedrun.

   In my most recent attempt to speedrun Super Mario Bros. 3, I almost managed to beat Richard Ureta's record.