Switching from one gait to another or change of rhythm within a gait.
An upward transition refers to switching from a gait to a higher gait such as going from walk to trot ot from trot to canter.
A downward transition means going from one gait to a lower one such as going from canter to trot or from trot to walk.
Transition within the gaits defines the act of changing the speed or rhythm while staying in the same gait. Going from collected canter to medium canter is a transition within the canter gait.
Related term: Gaits