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ari·o·so | \ ˌär-ē-ˈō-(ˌ)sō 
, -(ˌ)zō \
, -(ˌ)zō \ plural ariosos also ariosi\ ˌär-ē-ˈō-(ˌ)sē , -(ˌ)zē \
, -(ˌ)zē \Definition of arioso
: a musical passage or composition having a mixture of free recitative and metrical song
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Time Traveler for arioso
The first known use of arioso was in 1820
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