English translation: concomitantly // concurrently
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Explanation: According to the Diccionario de la Real Academia de la Lengua Española:
(Del lat. concomĭtans, -antis, de concomitāri, acompañar).
1. adj. Que aparece o actúa conjuntamente con otra cosa.
1. accompaniment, concomitant, co-occurrence -- (an event or situation that happens at the same time as or in connection with another)