Also means
focused
Usage Note
Concentrado functions as both an adjective and a noun. As an adjective it describes something dense or focused (zumo concentrado = concentrated juice; estaba muy concentrado = he was very focused). As a noun un concentrado refers to a concentrate (e.g. a food or chemical concentrate). The ser/estar distinction applies: ser concentrado is rare; estar concentrado describes current mental focus.
Examples
"El estudiante estaba concentrado en su tarea."
Natural Translation
The student was focused on his homework.

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