A plural or variant form of diurn; a collection of daily religious offices or a chronicle of daily events.
From Latin 'diurna' (daily things, daily record), this form represents the neuter plural of 'diurnus.' It was used in medieval Latin for daily records or journals.
In ancient Rome, 'acta diurna' (daily acts) were official daily records published in the forum—they're considered the ancestors of modern newspapers! The word 'diurna' captures that idea of documentation happening day by day.
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