synchronous

adjective2

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

   • There is a synchronous tie between the motors in each machine room to ensure that the span remains level during raising and lowering. — 1960
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. — 2014