Definition of "coinstantaneous" [co•in•stan•ta•ne•ous]

• Happening at the same instant. (adjective)

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• "In the case of the prawn-like crabs, their movements were as coinstantaneous as in a regiment of soldiers; but this cannot happen from anything like voluntary action with the ovules, or the confervae, nor is it probable among the infusoria."
• "The flash was almost coinstantaneous in the two rings, but it was just perceptible first in the anterior one."
• "Accordingly, when they have not been mixed, the actualized perceptions which perceive them will be two; but [if so, their perception must be successive not coinstantaneous, for] in one and the same faculty the perception actualized at any single moment is necessarily one, only one stimulation or exertion of a single faculty being possible at a single instant, and in the case supposed here the faculty is one."