Definition of simultaneity noun from the Oxford Advanced Learner's Dictionary

 

simultaneity

 noun
noun
BrE BrE//ˌsɪmltəˈneɪəti//
 
; NAmE NAmE//ˌsaɪmltəˈniːəti//
 
[uncountable]
 
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the fact of something happening or being done at the same time as something else the simultaneity of these two events