Other / Other
semblance - The way something appears on the surface, often without revealing the true nature or reality behind it.

In spite of their their kids' constant uncontrolled behavior, when they were outside they managed to keep up the semblance of calm, even though things were not so calm inside their house.
simultaneous - Refers to actions or events that are performed or experienced at the same time, without any time between them.

They made a simultaneous broadcast of the event across multiple time zones that allowed people from all over the world to watch it live.