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The Collaborative International Dictionary
Coinstantaneous

Coinstantaneous \Co*in"stan*ta"ne*ous\, a. Happening at the same instant.
--C. Darwin.

Wiktionary
coinstantaneous

a. Happening at the same instant.

Usage examples of "coinstantaneous".

In the case of the prawn-like crabs, their movements were as coinstantaneous as in a regiment of soldiers.