semplice

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sem·pli·ce

S0260100 (sĕm′plĭ-chā′)adv. & adj. Music In a simple or plain manner. Used chiefly as a direction.
[Italian, from Latin simplex, simplic-, simple; see sem- in Indo-European roots.]

semplice

(ˈsɛmplɪtʃɪ) adj, adv (Classical Music) music to be performed in a simple manner[Italian: simple, from Latin simplex]