Very or much; a musical direction meaning 'a lot' or 'greatly,' used to modify instructions like 'molto allegro' (very fast).
From Italian 'molto' meaning 'much' or 'very.' It entered English through music, where Italian terms are standard in classical music notation and terminology.
Musicians all over the world use Italian directions like 'molto' because Italy was the birthplace of opera and classical music—even English composers use Italian instead of English to describe how fast or slow to play!
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