  Bisimulation is a concept that captures behavioural equivalence. It has been
studied extensively on nonprobabilistic systems and on discrete-time Markov
processes and on so-called continuous-time Markov chains. In the latter time is
continuous but the evolution still proceeds in jumps. We propose two
definitions of bisimulation on continuous-time stochastic processes where the
evolution is a \emph{flow} through time. We show that they are equivalent and
we show that when restricted to discrete-time, our concept of bisimulation
encompasses the standard discrete-time concept. The concept we introduce is not
a straightforward generalization of discrete-time concepts.
