si·mul·ta·ne·i·ty
noun/ˌsɪmltəˈneɪəti/
/ˌsaɪmltəˈniːəti/
[uncountable]- the fact of something happening or being done at the same time as something else
同时发生(或进行)的;同步的 - the simultaneity of these two events
这两个事件的同时性
- the simultaneity of these two events