concierto
/konˈθjeɾto/ · B1 · noun · m
concert
🎻🎺 concierto = concert + o: Latin concertare, to strive together
Almost the English word: concert with an extra ie and a final o. Spanish stressed e often breaks into ie (cierto, tiempo), hence con-CIER-to. Italian concerto is the same word, which is why Spanish uses concierto for both a concert and a concerto.