The process of leaving the timestream at a given point, traversing through the timeless realm of Limbo for a timeless interval, and re-entering the timestream at another point, not having physically aged in transit. Since every future is conditioned on present events, one cannot always return to a given future. Also, since traveling into the past affects history in some way, however minor, one can never physically travel to one's own past, only to timelines that become divergent because of one's interference.
(See Also: Divergence)
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