1. Relating to something that is operating at a rate determined by the system rather than at a regular rate of chronological time; without a fixed time pattern: The injection of the new medication was supposed to correct the asynchronism of Kim's nerve impulses.
2. Describing the relationship of two or more systems that run at their own rates and interact at unpredictable times: Despite practicing for weeks, Sharon's jumping jack, or toy figure of a man with jointed limbs that could be moved by pulling attached strings, appeared to be resulting in asynchronisms or uncoordinated movements.