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La risposta è stata istantanea.
The response was instant.
Happening immediately, without any delay.
L'effetto del farmaco è istantaneo.
The effect of the medicine is instantaneous.
Ha una connessione internet istantanea.
He has an instant internet connection.
Often used to describe reactions, effects, or connections that occur without perceptible delay.
Don't confuse 'istantaneo' with 'istantaneo' as a noun (e.g., 'un istantaneo' = an instant photo). The adjective is far more common.
Use 'istantaneo' to emphasize that something happens without any perceptible delay, not just 'quick' or 'fast'.
From Latin *instantaneus*, derived from *instant-* (present participle of *instare*, 'to be present') + *-aneus* (suffix forming adjectives). The Latin root *instare* means 'to stand upon' or 'to be urgent', reflecting the idea of something pressing or immediate.
Used in both technical and everyday contexts. In computing, it often refers to real-time processing (e.g., 'messaggistica istantanea' = instant messaging). Avoid confusing with 'istantaneo' as a noun (rare, meaning 'something instantaneous').