Quickly or at a rapid speed; a musical term meaning to play fast.
From Spanish/Italian 'rapido' meaning 'rapid,' derived from Latin 'rapidus' meaning 'swift.' The term was adopted into English primarily through musical notation.
Musicians see this instruction all the time on sheet music, but it's interesting that music borrows Italian and Spanish terms to be universally understood—a violinist in Japan and Brazil both know what 'rapido' means!
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