“Instant” vs. “instantaneous”

What is the difference between instant and instantaneous? Which is correct in this sentence?

It had an almost __ response time.

Answer

Based on the fact that manufacturers of instant coffee never call it ‘instantaneous coffee’ I would say that ‘instant’ modifies a noun referring to a thing, whereas ‘instantaneous’ modifies a noun referring to an event. Your example falls in a grey area between the two, because the noun ‘time’ can refer to either the duration before the response occurs or the event of the response’s occurrence.

Attribution
Source : Link , Question Author : Kyle , Answer Author : d5e5

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