Between in Anne McCaffrey's Dragonriders of Pern series is a dimension through which dragons, watch-whers and fire lizards travel during the process of teleportation, referred to as "going between". If the dragon does not have a clear picture of its destination in mind, it is possible for the dragon and its passengers to become permanently lost in this dimension. Deliberately going "between" without a destination in mind is how dragons suicide, usually occurring when the rider that they are soul-bonded to dies of illness or injury, or if the dragon itself is mortally injured.
OmegaWiki Dictionary
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Between In the location or interval between two or among more objects, sides.
Between In the position or interval that separates two things.
