coinstantaneous

From co- +‎ instantaneous.

coinstantaneous (not comparable)

1. Happening at the same instant; simultaneous.
   • 1840, Charles Darwin, Journal of Researches Into the Geology and Natural History:

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

• “coinstantaneous”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.