/ ˈlɑːgəʊ; NAmE ˈlɑːrgoʊ/ adverb , adjective , noun
( music ) (from Italian )
■ adverb , adjective
(used as an instruction) in a slow, serious way
■ noun
( pl. ~os ) a piece of music to be performed in a slow, serious way
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WORD ORIGIN
Italian , from Latin largus copious, abundant.