mystery play
US /ˈmɪs.tər.i ˌpleɪ/
UK /ˈmɪs.tər.i ˌpleɪ/

1.
dramma sacro, mistero
a medieval drama based on biblical stories, especially the life of Christ or the saints, performed in churches or on movable stages
:
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The town's annual festival includes a traditional mystery play.
Il festival annuale della città include un tradizionale dramma sacro.
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Scholars study mystery plays to understand medieval religious theater.
Gli studiosi studiano i drammi sacri per comprendere il teatro religioso medievale.