synchronous

adj

1. At the same time, at the same frequency.

   “But in these pictures it was possible for all the incidents to coexist at the one moment. In the 'Release of Peter' this was not possible. The waking and astonished soldiers to the left might be looking upon the miracle of the centre, but the escape of the Apostle over their recumbent bodies could not be synchronous with either of the other scenes”

   “There is a synchronous tie between the motors in each machine room to ensure that the span remains level during raising and lowering.”

2. Interacting with other elements in series; blocking; interacting with the same program or thread as other operations, thereby preventing those operations from resuming until the operation of interest is complete.

   “Post is a “fire and forget” where the UI thread work is performed asynchronously; Send is synchronous in that the call blocks until the UI thread work has been performed.”