(1) Pertaining to two or more processes that depend upon the occurrences of specific events, such as a common timing signal. See also asynchronous.
(2) Occurring with a regular or predictable time relationship.
(3) In cross-site mirroring, pertaining to the mode of geographic mirroring where the program that issues the update waits until the operation is completed on both the production copy and the mirror copy. This mode ensures that once control is returned to the client, the operation is accurately reflected on both the production copy and the mirror copy.