criticality
noun uk/ˌkrɪt.ɪˈkæl.ə.ti/ us/ˌkrɪt.ɪˈkæl.ə.t̬i/
(NUCLEAR REACTION)
[ C or U ] physics specialized（核连锁反应的）临界状态;（核连锁反应发生的）临界条件
a nuclear chain reaction that is able to continue by itself, or the conditions under which this happens
A criticality can occur when too much radioactive material is placed together. 当过多放射性物质放置在一起时，就可能出现核连锁反应的临界条件。
(IMPORTANCE)
[ U ]极度重要性
the fact of being extremely important
Without denying the criticality of this particular problem, there are also others that need to be considered. 这个具体问题的严重性毋庸置疑，但同时也还有其他问题需要考虑。