- a Euclidean space of more than three dimensions.
- (in science fiction) a fantastical dimension in which the normal rules of space and time are altered, permitting extraordinary actions and events such as travel at speeds faster than light: As the spaceship entered hyperspace, we heard a loud screaming sound accompanied by intense vibration—and then nothing.
- links and their targets viewed collectively with reference to their organization, hierarchy, interrelationships, etc.: With this program you can build a naturally structured, tightly interlinked, and easily navigated hyperspace of educational material.Research on the internet often entails endless jumps through hyperspace, trying to sift good information from bad.
- space having more than three dimensions: often used to describe a multi-dimensional environment
- (in science fiction) a theoretical dimension within which conventional space-time relationship does not apply
