IPA: /kənˌtɛmpəˈreɪniːəti/
KK: /kənˌtɛmpəˈreɪniːəti/
The quality or state of existing or happening at the same time as something else.
The contemporaneity of the two events made it difficult to determine which one influenced the other.
Contemporaneity is formed from "con-" (meaning together) and "temporaneus" (from Latin, meaning pertaining to time). The word refers to the quality of existing or occurring at the same time as something else.
Think of things that exist 'together' ('con-') in 'time' ('temporaneus') — that's what contemporaneity means.