Fair, just, or righteous; in music, it means at the right tempo or in proper measure.
Italian adjective from Latin iustus meaning 'just,' 'fair,' or 'righteous'; also used as a musical term borrowed into English from Italian musical vocabulary.
Musicians borrow 'giusto' from Italian to mean 'at the right speed'—it's like classical music inherited Italian as a universal language because so many composers were Italian, so their words stuck around forever.
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